GitLab

Move the following from BridgedNativeWidget to
BridgedNativeWidgetHostImpl:
- ui::Compositor (as RecyclableCompositorMac)
- ui::LayerDelegate subclass
- ui::LayerOwner subclass
- ui::AcceleratedWidgetMacNSView subclass

Update BridgedNativeWidgetHost interface to include methods to
indicate the desired size and visibility of the ui::Compositor.

Add methods to BridgedNativeWidget which will in the future be
transferred to the abstract interface (when BridgedNativeWidget is
renamed to BridgedNativeWidgetImpl, which I'm still putting off for
merge-ability sake).
- OnCompositorCreated indicates that the compositor is created and
  should receive size and visibility updates
- SetCALayerParams sends the parameters needed to display the
  compositor contents in another process

Bug: 859152
Change-Id: I62209be44035f6b2b596afeb827cd951f30ef40c
Reviewed-on: https://chromium-review.googlesource.com/1166196
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581709}