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Manually cherry-picked following commits from AOMedia git repository:
bb2727c2 Sort includess for "clpf.h"
c297fd00 Add quantisation matrix range parameters.
0527894f Add encoder option and signaling for quant matrix control.
4106232b Turn off trellis coding for quantization matrices.
4017fca3 Modify tests to allow quantization matrices.
1c122c24 Add quant and dequant functions for new quant matrices.
95a89994 Enable CLPF
f72782bb Fix a build issue
73bae509 Add quantisation matrices and selection functions
33208d20 Added support for constrained low pass filter (CLPF)

Change-Id: I60fc1ee1ac40e6b9d1d00affd97547ee5d5dd6be

This is a debug tool used to detect bitstream error. On encoder side, it pushes
each bit and probability into a queue before the bit is written into the
Arithmetic coder. On decoder side, whenever a bit is read out from the
Arithmetic coder, it pops up the reference bit and probability from the queue as
well. If the two results do not match, this debug tool will report an error.
This tool can be used to pin down the bitstream error precisely. By combining
gdb's backtrace method, we can detect which module causes the bitstream error.

Change-Id: I133a4371fafdd48c488f2ca47f9e395676c401f2

spatial/temporal scalability are not supported in VP10 currently.
+ remove the unused vp10/encoder/skin_detection.[hc]

this also enables DatarateTestLarge for VP10 which passes with no
experiments enabled. these were removed previously when only the SVC
tests should have been:
134710af Disable tests not applicable to VP10

Change-Id: I9ee7a0dd5ad3d8cc1e8fd5f0a90260fa43da387c

supported by clang, gcc-4.9+

Change-Id: I893766de7307fef9a8b68c0cfae137c9d3b0dbe8
(cherry picked from commit 889ed5b158fc280927f2de9172d48245c3b735a7)

Change-Id: Ic90ebe6136f4b75645ba699d49c0bcb3764ddccf

Change-Id: I09b8acd22d031ece52e1fee18b998349bf1cf06b

Added a new expt rect-tx to be used in conjunction with ext-tx.
[rect-tx is a temporary config flag and will eventually be
merged into ext-tx once it works correctly with all other
experiments].

Added 4x8 and 8x4 tranforms for use initially with rectangular
sub8x8 y blocks as part of this experiment.

There is about a -0.2% BDRATE improvement on lowres, others pending.

When var-tx is on rectangular transforms are currently not used.
That will be enabled in a subsequent patch.

Change-Id: Iaf3f88ede2740ffe6a0ffb1ef5fc01a16cd0283a

This commit bring all up-to-date changes from master that are
applicable to nextgenv2. Due to the remove VP10 code in master,
we had to cherry pick the following commits to get those changes:

Add default flags for arm64/armv8 builds

Allows building simple targets with sane default flags.

For example, using the Android arm64 toolchain from the NDK:
https://developer.android.com/ndk/guides/standalone_toolchain.html
./build/tools/make-standalone-toolchain.sh --arch=arm64 \
  --platform=android-24 --install-dir=/tmp/arm64
CROSS=/tmp/arm64/bin/aarch64-linux-android- \
  ~/libvpx/configure --target=arm64-linux-gcc --disable-multithread

BUG=webm:1143

vpx_lpf_horizontal_4_sse2: Remove dead load.

Change-Id: I51026c52baa1f0881fcd5b68e1fdf08a2dc0916e

Fail early when android target does not include --sdk-path

Change-Id: I07e7e63476a2e32e3aae123abdee8b7bbbdc6a8c

configure: clean up var style and set_all usage

Use quotes whenever possible and {} always for variables.

Replace multiple set_all calls with *able_feature().

Conflicts:
	build/make/configure.sh

vp9-svc: Remove some unneeded code/comment.

datarate_test,DatarateTestLarge: normalize bits type

quiets a msvc warning:
conversion from 'const int64_t' to 'size_t', possible loss of data

mips added p6600 cpu support

Removed -funroll-loops

psnr.c: use int64_t for sum of differences

Since the values can be negative.

*.asm: normalize label format

add a trailing ':', though it's optional with the tools we support, it's
more common to use it to mark a label. this also quiets the
orphan-labels warning with nasm/yasm.

BUG=b/29583530

Prevent negative variance

Due to rounding, hbd variance may become negative. This commit put in
check and clamp of negative values to 0.

configure: remove old visual studio support (<2010)

BUG=b/29583530

Conflicts:
	configure

configure: restore vs_version variable

inadvertently lost in the final patchset of:
078dff7 configure: remove old visual studio support (<2010)

this prevents an empty CONFIG_VS_VERSION and avoids make failure

Require x86inc.asm

Force enable x86inc.asm when building for x86. Previously there were
compatibility issues so a flag was added to simplify disabling this
code.

The known issues have been resolved and x86inc.asm is the preferred
abstraction layer (over x86_abi_support.asm).

BUG=b:29583530

convolve_test: fix byte offsets in hbd build

CONVERT_TO_BYTEPTR(x) was corrected in:
003a9d2 Port metric computation changes from nextgenv2
to use the more common (x) within the expansion. offsets should occur
after converting the pointer to the desired type.

+ factorized some common expressions

Conflicts:
	test/convolve_test.cc

vpx_dsp: remove x86inc.asm distinction

BUG=b:29583530

Conflicts:
	vpx_dsp/vpx_dsp.mk
	vpx_dsp/vpx_dsp_rtcd_defs.pl
	vpx_dsp/x86/highbd_variance_sse2.c
	vpx_dsp/x86/variance_sse2.c

test: remove x86inc.asm distinction

BUG=b:29583530

Conflicts:
	test/vp9_subtract_test.cc

configure: remove x86inc.asm distinction

BUG=b:29583530

Change-Id: I59a1192142e89a6a36b906f65a491a734e603617

Update vpx subpixel 1d filter ssse3 asm

Speed test shows the new vertical filters have degradation on Celeron
Chromebook. Added "X86_SUBPIX_VFILTER_PREFER_SLOW_CELERON" to control
the vertical filters activated code. Now just simply active the code
without degradation on Celeron. Later there should be 2 set of vertical
filters ssse3 functions, and let jump table to choose based on CPU type.

improve vpx_filter_block1d* based on replace paddsw+psrlw to pmulhrsw

Make set_reference control API work in VP9

Moved the API patch from NextGenv2. An example was included.
To try it, for example, run the following command:
$ examples/vpx_cx_set_ref vp9 352 288 in.yuv out.ivf 4 30

Conflicts:
	examples.mk
	examples/vpx_cx_set_ref.c
	test/cx_set_ref.sh
	vp9/decoder/vp9_decoder.c

deblock filter : moved from vp8 code branch

The deblocking filters used in vp8 have been moved to vpx_dsp for
use by both vp8 and vp9.

vpx_thread.[hc]: update webp source reference

+ drop the blob hash, the updated reference will be updated in the
commit message

BUG=b/29583578

vpx_thread: use native windows cond var if available

BUG=b/29583578

original webp change:

commit 110ad5835ecd66995d0e7f66dca1b90dea595f5a
Author: James Zern <jzern@google.com>
Date:   Mon Nov 23 19:49:58 2015 -0800

    thread: use native windows cond var if available

    Vista / Server 2008 and up. no speed difference observed.

100644 blob 4fc372b7bc6980a9ed3618c8cce5b67ed7b0f412 src/utils/thread.c
100644 blob 840831185502d42a3246e4b7ff870121c8064791 src/utils/thread.h

vpx_thread: use InitializeCriticalSectionEx if available

BUG=b/29583578

original webp change:

commit 63fadc9ffacc77d4617526a50c696d21d558a70b
Author: James Zern <jzern@google.com>
Date:   Mon Nov 23 20:38:46 2015 -0800

    thread: use InitializeCriticalSectionEx if available

    Windows Vista / Server 2008 and up

100644 blob f84207d89b3a6bb98bfe8f3fa55cad72dfd061ff src/utils/thread.c
100644 blob 840831185502d42a3246e4b7ff870121c8064791 src/utils/thread.h

vpx_thread: use WaitForSingleObjectEx if available

BUG=b/29583578

original webp change:

commit 0fd0e12bfe83f16ce4f1c038b251ccbc13c62ac2
Author: James Zern <jzern@google.com>
Date:   Mon Nov 23 20:40:26 2015 -0800

    thread: use WaitForSingleObjectEx if available

    Windows XP and up

100644 blob d58f74e5523dbc985fc531cf5f0833f1e9157cf0 src/utils/thread.c
100644 blob 840831185502d42a3246e4b7ff870121c8064791 src/utils/thread.h

vpx_thread: use CreateThread for windows phone

BUG=b/29583578

original webp change:

commit d2afe974f9d751de144ef09d31255aea13b442c0
Author: James Zern <jzern@google.com>
Date:   Mon Nov 23 20:41:26 2015 -0800

    thread: use CreateThread for windows phone

    _beginthreadex is unavailable for winrt/uwp

    Change-Id: Ie7412a568278ac67f0047f1764e2521193d74d4d

100644 blob 93f7622797f05f6acc1126e8296c481d276e4047 src/utils/thread.c
100644 blob 840831185502d42a3246e4b7ff870121c8064791 src/utils/thread.h

vp9_postproc.c missing extern.

BUG=webm:1256

deblock: missing const on extern const.

postproc - move filling of noise buffer to vpx_dsp.

Fix encoder crashes for odd size input

clean-up vp9_intrapred_test

remove tuple and overkill VP9IntraPredBase class.

postproc: noise style fixes.

gtest-all.cc: quiet an unused variable warning

under windows / mingw builds

vp9_intrapred_test: follow-up cleanup

address few comments from ce050afaf3e288895c3bee4160336e2d2133b6ea

Change-Id: I3eece7efa9335f4210303993ef6c1857ad5c29c8

BUG=b/29583530

Change-Id: If08ce6ca352f377ac4db6b9b1909b507bba6d872
(cherry picked from commit 078dff72ca7bff079cb3c56d98c588c6ea6d2814)
(cherry picked from commit 046226376533b610ddc700f14409f195aa6abd51)

Change-Id: I38f7684969f12a624980f4e06698379a49e61bdf

Each time a codec is enabled or disabled with the umbrella
--enable-vpN flag, set the encoder and decoder configurations as well.
This was done as a post-processing step but doing that lost the order of
the arguments.

BUG=webm:1205

Change-Id: Ic629bfdd06acc04bc5a7227309f36bba54dad8b1

Change-Id: I4b5e1251dc215073384e168a6f845ae059d6c4f2

Also allows use of --enable-shared when configuring for Mac OS X,
producing a bare .dylib.

Enabling the shared framework bumps the iOS deployment target to 8.0,
the minimum required to support dynamic framework deployment in apps.

When not using --enable-shared, a static library for iOS 6.0+ will still
be built.

Minimum version settings have been moved into ios-version.sh so they
can be updated in a single place.

As with the static build, unless header search paths are manually
tweaked, users must add a VPX prefix on includes, such as:

  #include <VPX/vpx/vpx_decoder.h>

A module map for headers is not yet included as inttypes.h is not
modular; this means that VPX cannot be used directly in Swift code,
but can still be pulled in through an Objective-C wrapper.

BUG=https://bugs.chromium.org/p/webm/issues/detail?id=1092
Change-Id: I28fb06ce65e48ed167a88c14a7bfb2861989317e

This flag is not in effect in the codebase. The related contents
have been merged.

Change-Id: I7125ccbedf39e4683d117ecb72ffdd7547c23fc4

Change-Id: I3575f688ad473d9750a16c7dae74f5f97d026b26

This experiment will implement the use of a backward prediction
reference without temporal filtering. No overlay frame will be
transmitted, instead, the flag of show_existing_frame will be turned
on.

Change-Id: I361a3004344e2ca6b63723f660635c0d790ee036

Change-Id: I3f240fb46716b70e7c0ddd40660f55e1285875cd

- iOS SDKs no longer ship with armv6 support.
- Our minimum iOS version means all target devices have neon.
- Remove armv6 darwin LD workaround.
  - This removes a TODO.

Change-Id: I2fcb5b82c96213364275475be021c7dd8459d5c0

Change-Id: I23efc07572b2406ce5d9283340aef5aee8326280

Change-Id: I312af6af911cd0f52357745324b74e56a8d08d70

Change-Id: I91d280a64d1da77be31004ea91d08d1a70529e42

For experiments to improve compression efficiency of entropy coding.

Change-Id: Idf30dc554bd7eea3a79d21d18515c3e6b8f64b26

Using the up-sampled reference frames in sub-pixel motion search is
enabled as a speed feature for good-quality mode speed 0 and speed 1.

Change-Id: Ieb454bf8c646ddb99e87bd64c8e74dbd78d84a50

Change-Id: I6c3bf5545c42030b484a8aaf434b63bd409a0487

Up-sampled the reference frames to 8 times in each dimension using
the 8-tap interpolation filter. In sub-pixel motion search, use the
up-sampled reference frames to find the best matching blocks. This
largely improved the motion search precision, and thus, improved
the compression quality. There was no change in decoder side.

Borg test and speed test results:
1. On derflr set,
Overall PSNR gain: 1.306%, and SSIM gain: 1.512%.
Average speed loss on derf set was 6.0%.
2. On stdhd set,
Overall PSNR gain: 0.754%, and SSIM gain: 0.814%.
On hevchd set,
Overall PSNR gain: 0.465%, and SSIM gain: 0.527%.
Speed loss on HD clips was 3.5%.

Change-Id: I300ebaafff57e88914f3dedc8784cb21d316b04f

obmc: We add an obmc prediction mode at superblock level.
When it is enabled, predictors of the above and left blocks
are used to refine the regular block-based motion compensation.

Change-Id: I6310104ea3dfece16d736351e368861471dd1c9b

And enabled the warning flag in configure for vp10.

Change-Id: If556d6fac65755af3d6ed7fe71b8eca0ef1b1965

Temporaly disable warning for unused function for vp10, needs clean
out the warnings before re-enable the flag for vp10.

Change-Id: I5636f8cd607423f6ea6963db9c2cbd688e30b495

when INLINE is defined and mips is not being targeted. otherwise keep
the old --enable-extra-warnings behavior

Change-Id: Iba576edbe5fca03efa56ce99eee11f9cafc573ad

ext-partition: to hold partition extensions (ex. ext-partition,
ext-coding-unit-size from nextgen)
loop-restore: to hold in-loop restoration filter (ex. loop-postfilter
from nextgen and other Wiener restoration filters)

Change-Id: I71c7f1588f05fb0f2b00f7004a78e90c9cceae3f

Change-Id: Ie41bc72127e700887566dcc951da9d83a0b94891

Also includes a bug fix.

Change-Id: Ia49ed00f8ffd1531c10bcf89b1f497310ee7cb82

The nominal tx_type for a given mode is used as a context
to encode the actual tx_type for intra.

Results:
derflr: -0.241% BDRATE
hevcmr: -0.366% BDRATE

Change-Id: Icfe7b0a58d79bc6497a06e3441779afec6e01e21

This commit adds a new configure option:

--enable-better-hw-compatibility

The purpose of the configure option is to provide information on known
hardware decoder implementation bugs, so encoder implementers may
choose to implement their encoders in a way to avoid triggering these
decoder bugs.

The WebM team were made aware of that a number of hardware decoders
have trouble in handling the combination of scaled frame reference
frame and 8x4 or 4x8 partitions. This commit added asserts to vp9
decoder, so when built with above configure option, the decoder can
assert if an input bitstream triggers such decoder bug.

Change-Id: I386204cfa80ed16b50ebde57f886121ed76200bf

Change-Id: I6998e15f9ed2849a270033217c02e27c79ee8343

https://bugs.chromium.org/p/webm/issues/detail?id=1119

Change-Id: I88891d9f0be29ac6f845d2b470e5735dad16e693

Change-Id: Ie2101e362aeb01681313adf67596bc6b479e873e

--disable-XXX has the effect of disabling all extensions above it, e.g.,
--disable-ssse3 disables ssse3-avx2.

Change-Id: If02b44ca71ee12e4acb12010db8593a7989f2a9d

Change-Id: Ie43027f7d46c43df137fd4a7f731ff6ccb78fcee

Change-Id: I174f5b41be384894e41b8e2926cbf8fd0f8e21b2