cc: Support mask layers in impl-side painting

cc/layer_tree_host_common.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layer_tree_host_common.h"
 
 #include <algorithm>
 
 #include "base/debug/trace_event.h"
 #include "cc/layer.h"
@@ skipping 215 matching lines @@
     // In particular, it should not cause the subtree to be skipped.
     return !layer->opacity() && !layer->opacityIsAnimating();
 }
 
 // Called on each layer that could be drawn after all information from
 // calcDrawProperties has been updated on that layer.  May have some false
 // positives (e.g. layers get this called on them but don't actually get drawn).
 static inline void markLayerAsUpdated(LayerImpl* layer)
 {
     layer->didUpdateTransforms();
+
+    // Mask layers don't get this call, so explicitly update them so they can
+    // kick off tile rasterization.
+    if (layer->maskLayer())
+        layer->maskLayer()->didUpdateTransforms();
+    if (layer->replicaLayer()) {
+        layer->replicaLayer()->didUpdateTransforms();
+        if (layer->replicaLayer()->maskLayer())
+            layer->replicaLayer()->maskLayer()->didUpdateTransforms();
+    }
 }
 
 static inline void markLayerAsUpdated(Layer* layer)
 {
 }
 
 template<typename LayerType>
 static bool subtreeShouldRenderToSeparateSurface(LayerType* layer, bool axisAlignedWithRespectToParent)
 {
     //
@@ skipping 872 matching lines @@
 
   // At this point, we think the point does hit the touch event handler region on the layer, but we need to walk up
   // the parents to ensure that the layer was not clipped in such a way that the
   // hit point actually should not hit the layer.
   if (pointIsClippedBySurfaceOrClipRect(screenSpacePoint, layerImpl))
      return false;
 
   return true;
 }
 }  // namespace cc