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This is a reland of ed3b55f6

Original change's description:
> media/gpu/test: Group ivf frames whose timestamps are same
> 
> The served stream in webrtc can be dumped by the chrome
> option [1]. When the stream structures spatial-layers, one
> spatial layer is separately saved in one ivf in the dumped
> ivf file.
> 
> On the other hand, to play the ivf file properly, it is needed
> to group the spatial layers, which have the same timestamp in
> ivf frame header. IvfFileReader [2] in webrtc does so in fact.
> 
> This applies the group logic to our own ivf parser used in
> VDA test. This enables us to test SVC stream in VDA test.
> 
> [1] --force-fieldtrials=WebRTC-DecoderDataDumpDirectory/;tmp;
> [2] https://source.chromium.org/chromium/chromium/src/+/master:third_party/webrtc/modules/video_coding/utility/ivf_file_reader.h
> 
> Bug: 1044816
> Test: video.DecodeAccel.vp9_ksvc
> Change-Id: I9a0bcfa9083dc71333ad3c727d6cbb6d902202bc
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032453
> Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
> Reviewed-by: David Staessens <dstaessens@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#740575}

Bug: 1044816
Change-Id: Ic617db810b7d46e2065b6363d27ac1326b35abbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2072341Reviewed-by: David Staessens <dstaessens@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746729}