cc: Remove DrawQuad::IterateResoruces

cc/quads/draw_quad.h

Index: cc/quads/draw_quad.h
diff --git a/cc/quads/draw_quad.h b/cc/quads/draw_quad.h
index 0e26b6329f080e76b05a50488cdc720a3df87b39..e320c34c1b7955b6eb50a8cb873f8ab71c9f47f7 100644
--- a/cc/quads/draw_quad.h
+++ b/cc/quads/draw_quad.h
@@ -96,9 +96,6 @@ class CC_EXPORT DrawQuad {
     return !opaque_rect.Contains(visible_rect);
   }
 
-  typedef base::Callback<ResourceId(ResourceId)> ResourceIteratorCallback;
-  virtual void IterateResources(const ResourceIteratorCallback& callback) = 0;
-
   // Is the left edge of this tile aligned with the originating layer's
   // left edge?
   bool IsLeftEdge() const { return !rect.x(); }
@@ -127,6 +124,24 @@ class CC_EXPORT DrawQuad {
 
   void AsValueInto(base::trace_event::TracedValue* value) const;
 
+  struct CC_EXPORT Resources {
+    static const size_t kMaxResourceIdCount = 4;
+    Resources();
+
+    ResourceId* begin() { return ids; }
+    ResourceId* end() {
+      DCHECK(IsCountValid());
+      return ids + count;
+    }
+
+    bool IsCountValid() const { return count <= kMaxResourceIdCount; }
+
+    size_t count;
+    ResourceId ids[kMaxResourceIdCount];
+  };
+
+  Resources resources;
+
  protected:
   DrawQuad();