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If a layer has a replica, which has a mask, then the layer itself does not
need to clip to its bounding box. This dcheck verified that it would.

Add some new unit tests and pixel tests that verify behaviour of the mask
texture with masked replicas. The current behaviour is correct. The
replica is masked at the origin of the replicated layer.

Tests:
LayerTreeHostImplTest.ReflectionMaskLayerWithDifferentBounds
LayerTreeHostImplTest.ReflectionMaskLayerForSurfaceWithUnclippedChild
LayerTreeHostImplTest.MaskLayerForSurfaceWithClippedLayer
LayerTreeHostMasksPixelTest.MaskOfLayer
LayerTreeHostMasksPixelTest.ImageMaskOfLayer
LayerTreeHostMasksPixelTest.MaskOfClippedLayer
LayerTreeHostMasksPixelTest.MaskWithReplica
LayerTreeHostMasksPixelTest.MaskWithReplicaOfClippedLayer
LayerTreeHostMasksPixelTest.MaskOfReplica
LayerTreeHostMasksPixelTest.MaskOfReplicaOfClippedLayer

R=enne
BUG=171734

Review URL: https://codereview.chromium.org/14244021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194639 0039d316-1c4b-4281-b951-d872f2087c98