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SurfaceTreeHost::UpdateHostWindowBounds() used to call
ui::Layer::SetFillsBoundsOpaquely() directly. With this CL, the method
is called through aura::Window::SetTransparent(). This is equivalent,
except that the |transparent_| bit of the aura::Window, on which
aura::WindowOcclusionTracker depends, is also updated.

This CL also adds a ScopedPauseOcclusionTracking instance to ensure
that occlusion isn't recomputed multiple times during a call to
SurfaceTreeHost::UpdateHostWindowBounds().

Bug: 668690
Change-Id: I4f6181d4e247f2a54d96569b3379964c9253246a
Reviewed-on: https://chromium-review.googlesource.com/970746Reviewed-by: David Reveman <reveman@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544362}