DNS: Testing for [blink] Support (semi-)transparent background colors.

third_party/WebKit/Source/platform/testing/WebLayerTreeViewImplForTesting.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 WebLayerTreeViewImplForTesting_h
 #define WebLayerTreeViewImplForTesting_h
 
 #include "cc/test/test_task_graph_runner.h"
 #include "cc/trees/layer_tree_host_client.h"
 #include "cc/trees/layer_tree_host_single_thread_client.h"
@@ skipping 29 matching lines @@
   // blink::WebLayerTreeView implementation.
   void setRootLayer(const blink::WebLayer&) override;
   void clearRootLayer() override;
   cc::AnimationHost* compositorAnimationHost() override;
   virtual void setViewportSize(const blink::WebSize& unusedDeprecated,
                                const blink::WebSize& deviceViewportSize);
   void setViewportSize(const blink::WebSize&) override;
   WebSize getViewportSize() const override;
   void setDeviceScaleFactor(float) override;
   void setBackgroundColor(blink::WebColor) override;
-  void setHasTransparentBackground(bool) override;
   void setVisible(bool) override;
   void setPageScaleFactorAndLimits(float pageScaleFactor,
                                    float minimum,
                                    float maximum) override;
   void startPageScaleAnimation(const blink::WebPoint& destination,
                                bool useAnchor,
                                float newPageScale,
                                double durationSec) override;
   void setNeedsBeginFrame() override;
   void setNeedsCompositorUpdate() override;
@@ skipping 42 matching lines @@
 
  private:
   cc::TestTaskGraphRunner m_taskGraphRunner;
   std::unique_ptr<cc::AnimationHost> m_animationHost;
   std::unique_ptr<cc::LayerTreeHost> m_layerTreeHost;
 };
 
 }  // namespace blink
 
 #endif  // WebLayerTreeViewImplForTesting_h