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The methods NativeWidgetMac::GetWindowBoundsInScreen,
GetClientAreaBoundsInScreen, and GetWorkAreaBoundsInScreen compute
their results by querying the underlying NSWindow.

When the NSWindow is a separate process, this won't be an option.
Instead, have the BridgedNativeWidget push these properties to the
BridgetNativeWidgetHost, from which the NativeWidgetMac may query them.

Also have the BridgedNativeWidget (in the app shim process) query the
display::Display for its NSWindow and send that to the
BridgetNativeWidgetHost (in the browser process). This can then be
used to update the device scale factor, vsync, and color space
properties of the compositor (at present these properties updated only
by attached RenderWidgetHostViewMacs).

Rename BridgedNativeWidgetHost::SetSize to SetViewSize, to indicate
that it is computed differently.

Remove BridgedNativeWidgetHost::SetCompositorSize as its functionality
can be rolled into the new function.

Bug: 859152
Change-Id: If00184c31f9c493ece4ea08ace11d0be3a866786
Reviewed-on: https://chromium-review.googlesource.com/1175428
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584308}