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Add level as a input test stream property to specify requested level. Currently
it is only valid for H264 codec. ForceLevel is implemented to check whether the
output level satisfies the requested one (only for H264 now). Moreover, in
order to test lower level (ex. Level1) a new test stream with the video size
128x96 is added to media/test/data.

In addition to verifying the level confiuration, it is also required to specify
the higher level (ex. Level5.1) for vea_unittest when we want to test 4k
(2160p) video encoding for 4k-supported platforms.

BUG=886564
TEST=build and run video_encode_accelerator_unittest on Eve and Elm
TEST=./video_encode_accelerator_unittest --test_stream_data=bear_320x192_40frames.yuv:320:192:1:out1.h264:200000:30::::40
TEST=./video_encode_accelerator_unittest --test_stream_data=bear_128x96_40frames.yuv:128:96:1:out1.h264:64000:30::::10
TEST=use 3840x2160 raw video as vea_unittest input with Level5.1 on Eve (2160p video is too big to upload to media/test/data)

Change-Id: I68512f5e848a35abbe0c3af802d0926261780241
Reviewed-on: https://chromium-review.googlesource.com/c/1469809Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Pin-chih Lin <johnylin@chromium.org>
Auto-Submit: Pin-chih Lin <johnylin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635066}