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This ensures TGs can be decoded even if the whole
frame has not been received and the frame length
is not known.

Change-Id: If24837fcc3b5c46554751be792e91100de73e8d6

Change-Id: Ifb93970ed876ed61259b2f8da739171857c97fda

This is a manual adaptation of the following commit from aom/master:
ce12003d

The original commit message:

A tile group is a set of tiles in scan order.

Each tile group has a version of uncompressed and compressed headers,
identical apart from tile group parameters.
Encoding probability updates takes account of the number of
headers to control overheads.

The decoder supports arbitrary numbers of tile groups with
arbitrary number of tiles. The number of tiles in a TG is
signalled in the uncompressed header for that TG.

The encoder currently only supports a fixed number
of TGs (3, when error resilient mode is on) of equal size
(except possibly for the last one).

The average BDR performnce with 3 tile groups versus
anchor with error resilient mode and up to 16 tiles is:

NR YCbCr:      3.02%      3.04%      3.05%
PSNRHVS:      3.09%
SSIM:      3.06%
MSSSIM:      3.05%
CIEDE2000:      3.04%

Change-Id: I9b97c5ed733103b9160a3a5d4370de5322c00c0b

For clarity, use separate variables for 'color_ctx_hash' and
'color_ctx' instead of reusing same variables for both.

BUG=webm:1324

Change-Id: I3a516ea54353e1f0737822c613a68da252e30c6e

Change-Id: I9398c77c12e9c4caa19a76b92e3035a3135cfd7a

Change-Id: I63e492163ef10e12a842837368c209b8ffc4eee0

Use unified transform block size and coding block size map. This
prepares for the integration of 2x2 transform block size and the
rectangular transform block size.

Change-Id: I99f51017d19aef337639b708ee9c7faedcc20935

Unify coefficient context used by different experiments. Make
block size and transform block size consistent with rest codebase.

Change-Id: I237336f161d6c473b88c59c48ee68d24b75ce738

Unify the transform block and coding block mapping.

Change-Id: Ifb394809a4aafee6adf2b49a2607036cf13c878e

Unify the transform block size to block size mapping.

Change-Id: Ic7359d016cd5965983c4a5476624c09f3123f91c

Change-Id: Ia69bceef24b61b0a222783eba79e7a70bb60edd8

It always returns true since the related misc_fix[1] was merged.

[1] 23e83574

Change-Id: Ie3af685572a2f0a42d2b9fb9903c1abeea225dfd

Change-Id: If497b53c3b36e32fb98c99dba2d4a490e226572a

No change in output for 4:2:0 and 4:4:4

Change-Id: Ic46753d23a5b5f90b611a3da1a4574870519957c

Make linking to libvpx and libaom at the same time possible.

Change-Id: I7bab8527a32e446e3d564e6fa5d94ccd056bc63f

Change-Id: Ie8bc40579720b8c402bbc8b23b6fd3a7a50834bb

Use the transform block partition depth counts to decide if to
reset the tx_mode at frame header level. Add a comment to make this
explicit.

Change-Id: I417920b4b61eeb91cde9536336a12deea2d42f79

Change-Id: I90518b7b5c8bb930f5eeef4ce4cbb536139722ca