Cherry-Picked the following commits:
0defd8f2 Changed "WebM" to "AOMedia" & "webm" to "aomedia"
54e66767 Replace "VPx" by "AVx"
5082a369 Change "Vpx" to "Avx"
7df44f17 Replace "Vp9" w/ "Av1"
967f722f Remove kVp9CodecId
828f30ce Change "Vp8" to "AOM"
030b5ffc AUTHORS regenerated
2524caee Add ref-mv experimental flag
016762be Change copyright notice to AOMedia form
81e55269 Replace vp9 w/ av1
9b94565b Add missing files
fa8ca9f2 Change "vp9" to "av1"
ec838b76  Convert "vp8" to "aom"
80edfa01 Change "VP9" to "AV1"
d1a11fb9 Change "vp8" to "aom"
7b582513 Point to WebM test data
dd1a5c8d Replace "VP8" with "AOM"
ff00fc0f Change "VPX" to "AOM"
01dee0bb Change "vp10" to "av1" in source code
cebe6f0c Convert "vpx" to "aom"
17b05679 rename vp10*.mk to av1_*.mk
fe5f8a8a rename files vp10_* to av1_*

Change-Id: I6fc3d18eb11fc171e46140c836ad5339cf6c9419

Manually cherry-picked commits:
ceef0583 libvpx->libaom part2
3d26d916 libvpx -> libaom
cfea7dd7 vp10/ -> av1/
3a8eff73 Fix a build issue for a test
bf4202ed Rename vpx to aom

Change-Id: I1b0eb5a40796e3aaf41c58984b4229a439a597dc

Change-Id: I208c84cce216464b82eaa51945ce17a8e6625673

Change-Id: Ibc7933fba85feeb30ef9b14b302d932aff19f54e

Export vpx_codec_enc_init_multi_ver so the vp8 multi res encoder example
can see it when building shared.

Change-Id: Ic5222b1b6d949f39c7e50c3bc58fb76bece2a3f1

vpx_svc_parameters_t contains id, resolution and min/max qp for each spatial layer.

In this change we will use extra config to send min/max qp and scaling factors, then calculate layer resolution inside encoder.

Change-Id: Ib673303266605fe803c3b067284aae5f7a25514a

1. This is to align with the ffmpeg implementation
2. Remove APIs for setting quantizers and scale-factors

Change-Id: I6e238d71db790a9fb3254baaeb61e2a5aac58f48

Change-Id: If8cd3879aa2a498a2b1b97cedb88b2b3bd97f0ba

1. svc_encodeframe.c will not handle frame or stats packets anymore.
   The app will process them.
2. Remove APIs that related to these packets.

Change-Id: Id0d7f8b458dc09c6f77064c0878fd4e572db001b

Change-Id: Ic0fb8e5016d064c2227cf5d87ffba86a4303c82b

      2. Add read/write for RC stats file
The two pass RC for svc does not work yet. This is just the first
step. We need further development to make it working.
Change-Id: I8ef0e177dff0b5ed3c97a916beea5123717cc6f2

also:
 o remove dead code, create_dummy_frame
 o Fix a bug in command line handling that caused a segfault if wrong
   number of arguments were given.

Change-Id: I78f026aee4e363967b750e6cde0982659c558a1f

SVC multiple layer per frame encoding is invoked with vpx_svc_init and
vpx_svc_encode. These interfaces are designed to be invoked from ffmpeg.
Additional improvements:
- make dummy frame handling a bit more explicit
- fixed bug with single layer encodes
- track individual frame sizes and psnrs instead of averages
- parameterized quantizer, 16th scalefactors, more logging,
- enabled single layer encodes to generate baseline
- include new mode for 3 layer I frame with 5 total layers

Change-Id: I46cfa600d102e208c6af8acd6132e0cc25cda8d4

This reverts commit a82001b1, reversing
changes made to f6d870f7.

This commit breaks windows builds and needs some work to fix those and
some additional comments.

Change-Id: Ic0b0228e36704b127e5e399ce59db26182cfffe7

These changes were originally made in the Stratacaster team-review repository

commit e114bffcd82ad74c3696ec58e13c0ac895d6c82d
Author: Charles 'Buck' Krasic <ckrasic@google.com>
Date:   Mon Oct 14 16:52:13 2013 -0700

    Make dummy frame handling a bit more explicit, fixing bug
    with single layer encodes.

Squashed commit of the following:

commit 1ebbfd976c0fadb02bf1ea562a2d0e3f0206daad
Merge: ac468dde 54e88b7
Author: Ivan Maltz <ivanmaltz@google.com>
Date:   Fri Oct 11 17:29:58 2013 -0700

    Move SVC code from vp9_spatial_scalable_encoder to libvpx module accessible from ffmpeg

commit 54e88b78b160becc9569fc3c6cb6b0a8c95dc357
Author: Ivan Maltz <ivanmaltz@google.com>
Date:   Tue Oct 8 09:08:40 2013 -0700

    common svc encoding code for sample app and ffmpeg

    added svc_encodeframe.c, svc_context.h, svc_test.cc

    vp9_spatial_scalable_encoder uses vpx_svc_encode

commit 5616ec8e2e3d3e8d277333d8a9242f6c70151162
Merge: 4528014 e29137df
Author: Ivan Maltz <ivanmaltz@google.com>
Date:   Tue Oct 8 08:47:58 2013 -0700

    Merge branch 'master' into stratacaster

commit 45280148450b1f3d61e390df8aadedf85cd5bce1
Merge: bb2b675 1ab60f7b
Author: Sujeevan Rajayogam <sujee@google.com>
Date:   Fri Oct 4 10:22:31 2013 -0700

    Merge branch 'master' into stratacaster

commit bb2b675e595dc9bfc8551e963edf56800c3aea61
Author: Sujeevan Rajayogam <sujee@google.com>
Date:   Wed Oct 2 12:37:26 2013 -0700

    Track individual frame sizes and psnrs instead of averages.

commit c6d303b714795c81e7ceb4173967115c9f8ff5b7
Merge: fa87df9 35830879
Author: Sujeevan Rajayogam <sujee@google.com>
Date:   Fri Sep 27 10:05:35 2013 -0700

    Merge branch 'master' into stratacaster

commit fa87df94fba923d9f7aeb8ae20c6e15f777e00b5
Merge: bf22d71 3c465af2
Author: Sujeevan Rajayogam <sujee@google.com>
Date:   Thu Sep 26 16:10:31 2013 -0700

    Merge branch 'master' into stratacaster

commit bf22d7144895a82e0c348ac177c8a261b9e2b88e
Author: Sujeevan Rajayogam <sujee@google.com>
Date:   Thu Sep 26 11:10:34 2013 -0700

    Parameterized quantizer, 16th scalefactors, more logging, enabled single layer encodes to generate baseline.

commit ceffd7e6025b765f9886b5ea0f324248aa37e327
Author: Sujeevan Rajayogam <sujee@google.com>
Date:   Thu Sep 19 10:04:49 2013 -0700

    - Include new mode for 3 layer I frame with 5 total layers.
    - Refactor svc api.

Change-Id: Ie4d775e21e006fa597d884c59488dc999478e9b5

This patch adds support for building shared libraries when configured
with the --enable-shared switch.

Building DLLs would require more invasive changes to the sample
utilities than I want to make in this patch, since on Windows you can't
use the address of an imported symbol in a static initializer. The best
way to work around this is proably to build the codec interface mapping
table with an init() function, but dll support is of questionable value
anyway, since most windows users will probably use a media framework
lib like webmdshow, which links this library in staticly.

Change-Id: Iafb48900549b0c6b67f4a05d3b790b2643d026f4