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Originally reviewed-on: https://chromium-review.googlesource.com/c/1292605

No change to the files in the reland. Added new web test. The issue that
caused the revert is addressed in dependent CLs (crbug/911823).

-- begin original commit msg --

Without the ffmpeg decoder configured, libavformat is unable to get the
codec profile and chromium ffmpeg wrapper code choose some defaults.
This will mess up the decode scenarios where non-ffmpeg decoders like vaapi
are in use. Fortunately, we can still get hold of the ffmpeg's
AVStream extradata param which should contain the
H264 AVCDecoderConfigurationRecord (ISO/IEC 14496-15).
So we use internal parser for extracting profile information
from this AVCDecoderConfigurationRecord.

BUG=784610,911823
TEST=media_unittests:FFmpegCommonTest.VerifyH264Profile
TBR=tguilbert@chromium.org

Change-Id: I021fb2c92e56846824a9e362d8f3ec8665724fb5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1362468Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Chrome Cunningham <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637915}