cc: Return resources to child compositor via a Callback.

cc/test/fake_delegated_renderer_layer_impl.h

Index: cc/test/fake_delegated_renderer_layer_impl.h
diff --git a/cc/test/fake_delegated_renderer_layer_impl.h b/cc/test/fake_delegated_renderer_layer_impl.h
index a9ca0f9f7950c9bb46babf6e818958f19310c03c..a958baf8c70aa712e9d8b5791739304eeb5f24be 100644
--- a/cc/test/fake_delegated_renderer_layer_impl.h
+++ b/cc/test/fake_delegated_renderer_layer_impl.h
@@ -24,9 +24,7 @@ class FakeDelegatedRendererLayerImpl : public DelegatedRendererLayerImpl {
   const ScopedPtrVector<RenderPass>& RenderPassesInDrawOrder() const {
     return RenderPassesInDrawOrderForTesting();
   }
-  const ResourceProvider::ResourceIdSet& Resources() const {
-    return ResourcesForTesting();
-  }
+  ResourceProvider::ResourceIdSet Resources() const;
 
   void SetFrameDataForRenderPasses(ScopedPtrVector<RenderPass>* pass_list);