cc: Toward merging DrawFrame and SwapBuffers in DelegatingRenderer.

cc/trees/layer_tree_host_unittest.cc

Index: cc/trees/layer_tree_host_unittest.cc
diff --git a/cc/trees/layer_tree_host_unittest.cc b/cc/trees/layer_tree_host_unittest.cc
index 829812bf152504261352a71d44c4129a910be9c4..9e3bb2259bff30f9ca9ebd5d506334314aee5856 100644
--- a/cc/trees/layer_tree_host_unittest.cc
+++ b/cc/trees/layer_tree_host_unittest.cc
@@ -6894,9 +6894,12 @@ class LayerTreeHostTestPaintedDeviceScaleFactor : public LayerTreeHostTest {
     PostSetNeedsCommitToMainThread();
   }
 
-  void DrawLayersOnThread(LayerTreeHostImpl* host_impl) override {
+  DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
+                                   LayerTreeHostImpl::FrameData* frame_data,
+                                   DrawResult draw_result) override {
     EXPECT_EQ(2.0f, host_impl->active_tree()->painted_device_scale_factor());
     EXPECT_EQ(1.0f, host_impl->active_tree()->device_scale_factor());
+    return draw_result;
   }
 
   void DisplayReceivedCompositorFrameOnThread(