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Make BrowserCompositorViewMac be the source of ScreenInfo, and merge
the update for screen properties with the resize update as
BrowserCompositorViewMac::UpdateNSViewAndDisplay.

Merge all RenderWidgetHostViewMac paths that update size or screen
info into RenderWidgetHostViewMac::UpdateNSViewAndDisplayProperties,
which communicates the changes (if any) to RenderWidgetHostImpl.

Change-Id: Idc7f654c93d0622815825fdb6fff46afcb38767e
Reviewed-on: https://chromium-review.googlesource.com/918284
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537240}