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Analyze HEVC stream with class H265Parser. It will be used in mp4 parser
to get the correct information on whether the current frame is key frame.

Currently it performs check of ITU-T Rec. H.265 (02/2018), section
7.4.2.4.4, Order or NAL units and coded pictures and their association
to access units.

Bug: 527595
Bug: internal b/114239680
Test: Play mp4 which marks all the video frames as key frame.
Change-Id: I975140241f47bcac21afa648f06207fddff3ec19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1629755Reviewed-by: Matthew Wolenetz <wolenetz@chromium.org>
Commit-Queue: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665022}