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Explicitly track consumed state for WindowInsets
Treating 0-insets as fully consumed is incorrect since it means that
you can't dispatch empty insets down the view hierarchy - traversal
terminates immediately. Track consumed state independent of actual
values. Replacing a given set of insets with all zeroes will mark it
consumed.
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Fix incorrect dispatch of empty WindowInsets from ActionBarOverlayLayout
Fix a bug where ActionBarOverlayLayout was using a private constructor
of WindowInsets to return empty insets that should have been marked
fully consumed. This caused dispatch to further child views not to
stop appropriately, corrupting application layout in some cases.
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Fix CTS regression in fitSystemWindows
Don't attempt to apply null insets from a call to fitSystemWindows.
Immediately return false since null insets cannot be applied.
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Bug: 15452706
Change-Id: I34276a90305b141b4653aef0048f70350c69d02a
11335f14b9