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This enables VideoFrameValidator in evey TestSimpleDecode test case, that is,
the test case except TestDecodeTimeMedia (performance test) and NoCrash.

Because an input stream is decoded repeatedly, the index in display order of
video frame on PictureReady() needs to be passed to VideoFrameValidator.
It seems there is no good way to get the frame index from Picture. So I just
count up the index on PictureReady() and reset it to 0 on NotifyResetDone().
This seems a hacky way and only works with the current VDA unittest, which
always rewind to the beginning of the stream and does not jump to the middle of
the stream.

BUG=chromium:856562
TEST=VDA unittest on eve with frame validator
$ ./video_decode_accelerator_unittest --test_video_data=test-25fps.h264:320:240:250:258:35:150:1 --ozone-platform=gbm  --test_import --frame_validator

Change-Id: I8fbbf165254f4e26c69f8da27b41ff3b9f395224
Reviewed-on: https://chromium-review.googlesource.com/c/1304286
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604171}