cc: Toward merging DrawFrame and SwapBuffers in DelegatingRenderer.

cc/trees/layer_tree_host_unittest.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_host.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 6929 matching lines @@
 // Makes sure that painted_device_scale_factor is propagated to the
 // frame's metadata.
 class LayerTreeHostTestPaintedDeviceScaleFactor : public LayerTreeHostTest {
  protected:
   void BeginTest() override {
     layer_tree()->SetPaintedDeviceScaleFactor(2.0f);
     EXPECT_EQ(1.0f, layer_tree()->device_scale_factor());
     PostSetNeedsCommitToMainThread();
   }
 
-  void DrawLayersOnThread(LayerTreeHostImpl* host_impl) override {
+  DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
+                                   LayerTreeHostImpl::FrameData* frame_data,
+                                   DrawResult draw_result) override {
+    EXPECT_EQ(DRAW_SUCCESS, draw_result);
     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(
       const CompositorFrame& frame) override {
     EXPECT_EQ(2.0f, frame.metadata.device_scale_factor);
     EndTest();
   }
 
   void AfterTest() override {}
 };
@@ skipping 73 matching lines @@
  private:
   FakeContentLayerClient client_;
   const gfx::Size viewport_size_;
   const gfx::Size large_image_size_;
 };
 
 SINGLE_AND_MULTI_THREAD_TEST_F(GpuRasterizationSucceedsWithLargeImage);
 
 }  // namespace
 }  // namespace cc