[Merge to 2883] mac: Fix bug where opacity is applied twice on RenderPassDrawQuads.

[Merge to 2883] mac: Fix bug where opacity is applied twice on RenderPassDrawQuads.

> When using the CoreAnimation compositor, RenderPassDrawQuads are copied to an
> IOSurface. The opacity is already applied there, so there's no need for the
> CoreAnimation Compositor to apply it again.
>
> BUG=660600
> CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel
>
> Review-Url: https://codereview.chromium.org/2467643002
> Cr-Commit-Position: refs/heads/master@{#429060}
> (cherry picked from commit 4a9cceac5f1883f48b564ad277d3d39cdd9f8615)

Committed: https://chromium.googlesource.com/chromium/src/+/8bebab8c7bad3e5c3e76ed8b83963ccd561dd522

[erikchen, 2016-11-02 18:10:11]

Description was changed from

==========
[Merge to 2883] mac: Fix bug where opacity is applied twice on
RenderPassDrawQuads.

> When using the CoreAnimation compositor, RenderPassDrawQuads are copied to an
> IOSurface. The opacity is already applied there, so there's no need for the
> CoreAnimation Compositor to apply it again.
>
> BUG=660600
> CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel
>
> Review-Url: https://codereview.chromium.org/2467643002
> Cr-Commit-Position: refs/heads/master@{#429060}
> (cherry picked from commit 4a9cceac5f1883f48b564ad277d3d39cdd9f8615)
==========

to

==========
[Merge to 2883] mac: Fix bug where opacity is applied twice on
RenderPassDrawQuads.

> When using the CoreAnimation compositor, RenderPassDrawQuads are copied to an
> IOSurface. The opacity is already applied there, so there's no need for the
> CoreAnimation Compositor to apply it again.
>
> BUG=660600
> CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel
>
> Review-Url: https://codereview.chromium.org/2467643002
> Cr-Commit-Position: refs/heads/master@{#429060}
> (cherry picked from commit 4a9cceac5f1883f48b564ad277d3d39cdd9f8615)

Committed:
https://chromium.googlesource.com/chromium/src/+/8bebab8c7bad3e5c3e76ed8b8396...
==========

[erikchen, 2016-11-02 18:10:13]

Committed patchset #1 (id:1) manually as
8bebab8c7bad3e5c3e76ed8b83963ccd561dd522.