Chrome Version: M69 3497
OS: Win10

What steps will reproduce the problem?
Run content\test\gpu\run_gpu_integration_test.py pixel --browser=release --test-filter="DirectComposition_Nonroot"
Or Run \content\test\data\gpu\pixel_video_nonroot.html

What is the expected result?
Pass. A image with gradient.
What happens instead?
Failure. A image without gradient.

Note: Nonroot underlay in the Direct Composition path is not enabled by default except for the protected video playback. Use command line '--enable-features=DirectCompositionNonrootOverlays,DirectCompositionUnderlays' to enable it. This DirectComposition_Nonroot pixel test uses gradient function and the test result shows this gradient, blending effect doesn't take effect. See pixel_video_nonroot.html for the test detail.