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Preivously, the shape of a window was not taken into account when
computing occlusion state. A window with a shape that didn't fully
cover its bounds could wrongly be considered to occlude another
window underneath it.

With this CL, shaped windows can't occlude other windows (similar
to windows that are animated or not axis-aligned).

Bug: 864508
Change-Id: I01ff1afda438982964cdc2d786f37caaa03677be
Reviewed-on: https://chromium-review.googlesource.com/1173318Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586011}