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ui::Layer has a cc::SurfaceLayer and can set its primary surface. This
change allows ui::Layer to also set whether or not cc::SurfaceLayer
should stretch its content to fill the surface bounds, which will either
stretch or shrink to fit the surface.

This change is driven by the intent for Picture-in-Picture to be able
to scale the video (contents) to fit into the PiP window bounds.
Since the PiP surface embedder, or OverlaySurfaceEmbedder, utilizes a
ui::Layer, this change would allow the ability to customize the
cc::SurfaceLayer be exposed. Further work for the PiP sizing will be
done, including maintaining the aspect ratio.

BUG: 819414 726621
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I3bdbf54635702414a4007912271118a57733ad05
Reviewed-on: https://chromium-review.googlesource.com/952476
Commit-Queue: apacible <apacible@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543289}