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EasyResizeWindowTargeter may be used to shrink the region of a window
you can interact with (the shelf uses this in certain modes). For mus
we only support this with a hit-test mask. This patch wires up
EasyResizeWindowTargeter to use a hit-test mask when necessary.

BUG=775223
TEST=covered by test

Change-Id: I3e1b494e890f0f8366ce4a8a1fc64f839a61542f
Reviewed-on: https://chromium-review.googlesource.com/826032
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Elliot Glaysher <erg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524019}