Further plumb visual rect into cc:DisplayItemList.

ui/compositor/paint_cache.h

Index: ui/compositor/paint_cache.h
diff --git a/ui/compositor/paint_cache.h b/ui/compositor/paint_cache.h
index b42c9c06ef7c15cea25056ce6634163ff61fbbd7..2070380a63499ccb893ee73a1a289da468445a4c 100644
--- a/ui/compositor/paint_cache.h
+++ b/ui/compositor/paint_cache.h
@@ -7,6 +7,7 @@
 
 #include "cc/playback/drawing_display_item.h"
 #include "ui/compositor/compositor_export.h"
+#include "ui/gfx/geometry/rect.h"
 
 namespace ui {
 class PaintContext;
@@ -29,9 +30,11 @@ class COMPOSITOR_EXPORT PaintCache {
   // Only PaintRecorder can modify these.
   friend PaintRecorder;
 
-  void SetCache(const cc::DrawingDisplayItem* item);
+  void SetCache(const gfx::Rect& layer_bounds,
+                const cc::DrawingDisplayItem* item);
 
   bool has_cache_;
+  gfx::Rect layer_bounds_;
   cc::DrawingDisplayItem display_item_;
 
   DISALLOW_COPY_AND_ASSIGN(PaintCache);