cc: Make OutputSurface::SwapBuffers pure virtual

cc/output/renderer_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 "cc/output/delegating_renderer.h"
 #include "cc/output/gl_renderer.h"
 #include "cc/output/output_surface.h"
 #include "cc/test/fake_output_surface_client.h"
 #include "cc/test/fake_renderer_client.h"
 #include "cc/test/test_context_provider.h"
 #include "cc/test/test_web_graphics_context_3d.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
 
+class TestOutputSurface : public OutputSurface {
+ public:
+  explicit TestOutputSurface(
+      const scoped_refptr<ContextProvider>& context_provider);
+  virtual ~TestOutputSurface() override;
+
+  // OutputSurface implementation
+  virtual void SwapBuffers(CompositorFrame* frame) override;
+};
+
+TestOutputSurface::TestOutputSurface(
+    const scoped_refptr<ContextProvider>& context_provider)
+    : OutputSurface(context_provider) {
+}
+
+TestOutputSurface::~TestOutputSurface() {
+}
+
+void TestOutputSurface::SwapBuffers(CompositorFrame* frame) {
+  client_->DidSwapBuffers();
+  client_->DidSwapBuffersComplete();
+}
+
 class MockContextProvider : public TestContextProvider {
  public:
   explicit MockContextProvider(scoped_ptr<TestWebGraphicsContext3D> context)
       : TestContextProvider(context.Pass()) {}
   MOCK_METHOD0(DeleteCachedResources, void());
 
  protected:
   ~MockContextProvider() {}
 };
 
@@ skipping 22 matching lines @@
   return GLRenderer::Create(
       client, settings, output_surface, resource_provider, NULL, 0);
 }
 
 template <typename T>
 class RendererTest : public ::testing::Test {
  protected:
   virtual void SetUp() {
     context_provider_ =
         new MockContextProvider(TestWebGraphicsContext3D::Create());
-    output_surface_.reset(new OutputSurface(context_provider_));
+    output_surface_.reset(new TestOutputSurface(context_provider_));
     output_surface_->BindToClient(&output_surface_client_);
     resource_provider_ = ResourceProvider::Create(
         output_surface_.get(), NULL, NULL, 0, false, 1, false);
     renderer_ = CreateRenderer<T>(&renderer_client_,
                                   &tree_settings_,
                                   output_surface_.get(),
                                   resource_provider_.get());
   }
 
   FakeRendererClient renderer_client_;
@@ skipping 12 matching lines @@
   EXPECT_CALL(*(this->context_provider_.get()), DeleteCachedResources())
       .Times(1);
 
   EXPECT_TRUE(this->renderer_->visible());
   this->renderer_->SetVisible(false);
   EXPECT_FALSE(this->renderer_->visible());
 }
 
 }  // namespace
 }  // namespace cc