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Three more cases are added to the Direct Composition Pixel tests.
Pixel_DirectComposition_Underlay test is created by adding a black block
on top of a video.
Pixel_DirectComposition_Nonroot test is created by adding a white gradient
blending effect on a video.
Pixel_DirectComposition_ComplexOverlays test is created by applying scaleX,
scaleY and rotate.

The H.264 mp4 video clip FourColors.mp4 used in these tests is created by
Maggie Chen. The video frames has 4 color blocks (Yellow, Red, Green, Blue)
and it looks like a still image. With this video, the pixel tests can be
done by solid color block comparisons. No golden images are needed.

Bug:848097

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I95483ba8c96c495b1150c749f1f55243c6a5efa5
Reviewed-on: https://chromium-review.googlesource.com/1136003
Commit-Queue: Maggie Chen <magchen@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576296}