Use surface copy requests for layout tests.

content/renderer/gpu/render_widget_compositor_unittest.cc

 // Copyright 2014 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 "content/renderer/gpu/render_widget_compositor.h"
 
 #include <utility>
 
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "cc/output/begin_frame_args.h"
+#include "cc/output/copy_output_request.h"
 #include "cc/test/failure_output_surface.h"
 #include "cc/test/fake_external_begin_frame_source.h"
 #include "cc/trees/layer_tree_host.h"
 #include "components/scheduler/renderer/renderer_scheduler.h"
 #include "content/public/test/mock_render_thread.h"
 #include "content/renderer/render_widget.h"
 #include "content/test/fake_compositor_dependencies.h"
 #include "content/test/fake_renderer_scheduler.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 28 matching lines @@
   void DidCompletePageScaleAnimation() override {}
   void DidCompleteSwapBuffers() override {}
   void ForwardCompositorProto(const std::vector<uint8_t>& proto) override {}
   bool IsClosing() const override { return false; }
   void OnSwapBuffersAborted() override {}
   void OnSwapBuffersComplete() override {}
   void OnSwapBuffersPosted() override {}
   void RequestScheduleAnimation() override {}
   void UpdateVisualState() override {}
   void WillBeginCompositorFrame() override {}
+  std::unique_ptr<cc::SwapPromise> RequestCopyOfOutputForLayoutTest(
+      std::unique_ptr<cc::CopyOutputRequest> request) override {
+    return nullptr;
+  }
 };
 
 class FakeRenderWidgetCompositorDelegate
     : public StubRenderWidgetCompositorDelegate {
  public:
   FakeRenderWidgetCompositorDelegate() = default;
 
   std::unique_ptr<cc::OutputSurface> CreateOutputSurface(
       bool fallback) override {
     EXPECT_EQ(
@@ skipping 215 matching lines @@
 }
 
 TEST_F(RenderWidgetCompositorOutputSurfaceTest, FallbackSuccessNormalSuccess) {
   // The first success is a fallback, but the next should not be a fallback.
   RunTest(false, RenderWidgetCompositor::OUTPUT_SURFACE_RETRIES_BEFORE_FALLBACK,
           1, 1);
 }
 
 }  // namespace
 }  // namespace content