The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9adcaaa25d78c548386d17427fb5cb03e420457e

commit 9adcaaa25d78c548386d17427fb5cb03e420457e
Author: Brian Salomon <bsalomon@google.com>
Date: Wed Oct 03 21:10:31 2018

Don't use SkBlendMode::kSrc when quads are opaque in SkiaRenderer.

If quads are antialiased this can trigger shader blending.

Also Skia has optimized code paths for textures drawn src-over.

Bug: 811523
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I9f0405d7651464aeb761c02f5d16f4de29dbbd75
Reviewed-on: https://chromium-review.googlesource.com/c/1259543
Reviewed-by: weiliangc <weiliangc@chromium.org>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Cr-Commit-Position: refs/heads/master@{#596363}
[modify] https://crrev.com/9adcaaa25d78c548386d17427fb5cb03e420457e/components/viz/service/display/skia_renderer.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/980cf77f69d8e17347c91b4edfe33faac6c5a833

commit 980cf77f69d8e17347c91b4edfe33faac6c5a833
Author: Brian Salomon <bsalomon@google.com>
Date: Thu Nov 29 21:40:19 2018

Reduce the number of drawImageSet calls in SkiaRenderer.

We now will group tile quads with different SharedQuadStates.

This is done by using per-image alpha in experimental_drawImageSetV1 and
by applying the matrix and scissor to the rendered rectangles when the
transform is positive scale and translate.

Bug: 811523
Change-Id: If9f5f7fe045b7e0170159a90c1694e664a569ae8
Reviewed-on: https://chromium-review.googlesource.com/c/1352669
Reviewed-by: weiliangc <weiliangc@chromium.org>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Cr-Commit-Position: refs/heads/master@{#612373}
[modify] https://crrev.com/980cf77f69d8e17347c91b4edfe33faac6c5a833/components/viz/service/display/skia_renderer.cc
[modify] https://crrev.com/980cf77f69d8e17347c91b4edfe33faac6c5a833/components/viz/service/display/skia_renderer.h