Implement new RPDQ copy logic for CALayer promotion.

cc/output/ca_layer_overlay.h

Index: cc/output/ca_layer_overlay.h
diff --git a/cc/output/ca_layer_overlay.h b/cc/output/ca_layer_overlay.h
index 0b3f79d3f6a3e6a110b5ad601770655b7d3087a3..17b4be223679c7bbdafa90f499bc869cd0dc3d2d 100644
--- a/cc/output/ca_layer_overlay.h
+++ b/cc/output/ca_layer_overlay.h
@@ -15,6 +15,7 @@
 namespace cc {
 
 class DrawQuad;
+class RenderPassDrawQuad;
 class ResourceProvider;
 
 // Holds information that is frequently shared between consecutive
@@ -23,7 +24,6 @@ class CC_EXPORT CALayerOverlaySharedState
     : public base::RefCounted<CALayerOverlaySharedState> {
  public:
   CALayerOverlaySharedState() {}
-
   // Layers in a non-zero sorting context exist in the same 3D space and should
   // intersect.
   unsigned sorting_context_id = 0;
@@ -63,6 +63,9 @@ class CC_EXPORT CALayerOverlay {
   unsigned edge_aa_mask = 0;
   // The minification and magnification filters for the CALayer.
   unsigned filter;
+  // If |rpdq| is present, then the renderer must draw the filter effects and
+  // copy the result into an IOSurface.
+  const RenderPassDrawQuad* rpdq = nullptr;
 };
 
 typedef std::vector<CALayerOverlay> CALayerOverlayList;