cc: Move copy requests from layers to the effect tree

cc/test/layer_test_common.cc

Index: cc/test/layer_test_common.cc
diff --git a/cc/test/layer_test_common.cc b/cc/test/layer_test_common.cc
index a5d8e221e1243cded78a8f7ee8b25634f8fb7d73..ea49f5f1eab3832ea6b890dc2dd5c037613af001 100644
--- a/cc/test/layer_test_common.cc
+++ b/cc/test/layer_test_common.cc
@@ -209,10 +209,8 @@ void LayerTestCommon::LayerImplTest::AppendSurfaceQuadsWithOcclusion(
 void EmptyCopyOutputCallback(std::unique_ptr<CopyOutputResult> result) {}
 
 void LayerTestCommon::LayerImplTest::RequestCopyOfOutput() {
-  std::vector<std::unique_ptr<CopyOutputRequest>> copy_requests;
-  copy_requests.push_back(
+  root_layer()->test_properties()->copy_requests.push_back(
       CopyOutputRequest::CreateRequest(base::Bind(&EmptyCopyOutputCallback)));
-  root_layer()->PassCopyRequests(&copy_requests);
 }
 
 }  // namespace cc