Adding unit test for DrawingBuffer's bitmap recycling mechanism

content/test/test_blink_web_unit_test_support.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_TEST_TEST_BLINK_WEB_UNIT_TEST_SUPPORT_H_
 #define CONTENT_TEST_TEST_BLINK_WEB_UNIT_TEST_SUPPORT_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
@@ skipping 15 matching lines @@
 namespace blink {
 class WebLayerTreeView;
 }
 
 namespace blink {
 namespace scheduler {
 class RendererScheduler;
 }
 }
 
+namespace cc {
+class TestSharedBitmapManager;
+}
+
 namespace content {
 
 // An implementation of BlinkPlatformImpl for tests.
 class TestBlinkWebUnitTestSupport : public BlinkPlatformImpl {
  public:
   TestBlinkWebUnitTestSupport();
   ~TestBlinkWebUnitTestSupport() override;
 
   blink::WebBlobRegistry* getBlobRegistry() override;
   blink::WebClipboard* clipboard() override;
@@ skipping 22 matching lines @@
 
   blink::WebGestureCurve* createFlingAnimationCurve(
       blink::WebGestureDevice device_source,
       const blink::WebFloatPoint& velocity,
       const blink::WebSize& cumulative_scroll) override;
 
   blink::WebURLLoaderMockFactory* getURLLoaderMockFactory() override;
 
   blink::WebThread* currentThread() override;
 
+  std::unique_ptr<cc::SharedBitmap> allocateSharedBitmap(
+      const blink::WebSize& size) override;
+
   void getPluginList(bool refresh,
                      const blink::WebSecurityOrigin& mainFrameOrigin,
                      blink::WebPluginListBuilder* builder) override;
 
  private:
   MockWebBlobRegistryImpl blob_registry_;
   SimpleWebMimeRegistryImpl mime_registry_;
   std::unique_ptr<MockWebClipboardImpl> mock_clipboard_;
   WebFileUtilitiesImpl file_utilities_;
   base::ScopedTempDir file_system_root_;
   std::unique_ptr<blink::WebURLLoaderMockFactory> url_loader_factory_;
   cc_blink::WebCompositorSupportImpl compositor_support_;
   std::unique_ptr<blink::scheduler::RendererScheduler> renderer_scheduler_;
   std::unique_ptr<blink::WebThread> web_thread_;
+  std::unique_ptr<cc::TestSharedBitmapManager> shared_bitmap_manager_;
 
 #if defined(OS_WIN) || defined(OS_MACOSX)
   blink::WebThemeEngine* active_theme_engine_ = nullptr;
 #endif
   DISALLOW_COPY_AND_ASSIGN(TestBlinkWebUnitTestSupport);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_TEST_BLINK_WEB_UNIT_TEST_SUPPORT_H_