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: I1138fbeff5f63beb5c0de2c357793da12502d453

Fails with Icac63051bf37c7355e661837b57c257d58c764fc reverted.

Change-Id: I460d7a5a74faa4daace25f911f8dc5f68e16c951

The y4m extension used is the same as the one used in ffmpeg/x264.
The patch is adapted from the highbitdepth branch.

Also adds unit tests for y4m header parsing and md5 check
of the raw frame data, as well as y4m writing.

[build fix for Mac/VS by not using tuples with strings]

Change-Id: I40897ee37d289e4b6cea6fedc67047d692b8cb46

Reverting "Adds support for reading and writing 10/12-bit y4m" for now because of Mac Build Failure.

This reverts commit 82dc1332

Change-Id: I824bf42bf47c7df6985c79e451d6af913030d374

The y4m extension used is the same as the one used in ffmpeg/x264.
The patch is adapted from the highbitdepth branch.

Also adds unit tests for y4m header parsing and md5 check
of the raw frame data, as well as y4m writing.

Change-Id: Ie2794daf6dbafd2f128464f9b9da520fc54c0dd6

Begin() will be called twice with 2-pass encodes, invoking
y4m_input_open which allocates memory; close the old instance first.

Change-Id: Id252a21d286ca9ae998bd87599d43aeb8d7d77aa

Change-Id: I826655a708010149de231ca31a2e3ba4f1842c0c

Change-Id: Ida3128e7e8a2ed333ac0b4ee92c23cb7dc1b7843

Suggested by James Zern to clear out cpplint warnings for all unit
test code.

Change-Id: I731a3fa4d2a257eb9ef733426ba84286fbd7ea34

if the caller did not abort after an ASSERT failure in Begin()
FillFrame() would segfault.

Change-Id: I2d3f5a0918611bbd081be6f686dea19c56695073

ctor inputs are ints as are vpx_rational_t members

Change-Id: I62a39bf3df123727a872e40b74e3ee9e55ef2ede

Code was previously using VPX_IMG_FMT_VPXI420, which was intended to be the
"vpx" non-YUV colorspace variant.

Change-Id: Icf8771eeefeb574055ed638a93450c3d0ed5b9f5

Fix the video source to close if file is open already and add a limit.

Change-Id: I36ada4c609d027b6eaa9b447fe9ad4115532edc1

Got 61 test vectors from vp8-test-vectors.git
(http://git.chromium.org/gitweb/?p=webm/vp8-test-vectors.git)

Added decoder test vectors downloading in unit tests. Uploaded
the test vectors and their md5 files to WebM website.
  $ gsutil cp *.* gs://downloads.webmproject.org/test_data/libvpx

Added their sha1sum to the test/test-data.sha1 file.

In unit tests, download the test vectors to LIBVPX_TEST_DATA_PATH.

Test_vector_test goes through the test vectors, decodes them, and
compute the md5 checksums. The checksums are compared with the
expected md5 checksums to tell if the decoder decodes correctly.

Change-Id: Ia1e84f9347ddf1d4a02e056c0fee7d28dccfae15

silences valgrind warnings about uninitialized values in SetSize()

Change-Id: I54c4fdcc246687793393735b213c8777e79e47da

To do so we add a framework for encoding a yv12 file..

Change-Id: I94a061eb916beaf6cde920cf1aaadb6eed10a717