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Decoded pictures (i.e. yuv format) on h264, vp8 and vp9 must be identical on any
platforms, except its pixel format and device alignment.
VideoFrameValidator checks soundness of each decoded picture comparing its
md5sum value with golden md5sum.
VideoFrameMapper used by VideoFrameValidator map decoded pictures and converts
them, by libyuv, to I420 picture to resolve pixel format and device alignment
differences.

This change is the first step for it. VideoFrameValidator would support non
tiled buffers.

BUG=chromium:856562
TEST=VDA unittest on h264, vp8 and vp9 with --frame_validator at veyron_minnie and kevin,
$ ./video_decode_accelerator_unittest --test_video_data=test-25fps.vp8:320:240:250:250:35:150:11 --ozone-platform=gbm --gtest_filter=Thumbnail/VideoDecodeAcceleratorParamTest.TestSimpleDecode/0 --test_import --frame_validator

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Iddd284bd47b2a5bb9921dc8d54f9d77ed694f5ad
Reviewed-on: https://chromium-review.googlesource.com/c/1172266
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601216}