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This CL adds a new flag, UseSurfaceLayerForVideoPIP, which will
switch to SurfaceLayer only when entering PIP mode.  The player does
not switch back when exiting PIP.

When doing this, the VideoFrameCompositor, VFS, etc. all run on
the compositor impl thread rather than a dedicated media thread.
This is to simplify the switchover.

This CL also changes the default from Use...Video to Use...PIP.

This is based on
https://chromium-review.googlesource.com/c/chromium/src/+/1219948

Bug: 883931

Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ibb612d83df721712929aeab42aba790e32c1a8ea
Reviewed-on: https://chromium-review.googlesource.com/1220562Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594459}