Introduce painted-device-scale-factor and use it when --enable-use-zoom-for-dsf is specified.

content/renderer/gpu/render_widget_compositor.h

 // Copyright (c) 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_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_H_
 #define CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_H_
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
@@ skipping 71 matching lines @@
   cc::ManagedMemoryPolicy GetGpuMemoryPolicy(
       const cc::ManagedMemoryPolicy& policy);
 
   // WebLayerTreeView implementation.
   void setRootLayer(const blink::WebLayer& layer) override;
   void clearRootLayer() override;
   void attachCompositorAnimationTimeline(
       blink::WebCompositorAnimationTimeline* compositor_timeline) override;
   void detachCompositorAnimationTimeline(
       blink::WebCompositorAnimationTimeline* compositor_timeline) override;
-  virtual void setViewportSize(
-      const blink::WebSize& unused_deprecated,
-      const blink::WebSize& device_viewport_size);
   void setViewportSize(const blink::WebSize& device_viewport_size) override;
   virtual blink::WebFloatPoint adjustEventPointForPinchZoom(
       const blink::WebFloatPoint& point) const;
   void setDeviceScaleFactor(float device_scale) override;
   void setBackgroundColor(blink::WebColor color) override;
   void setHasTransparentBackground(bool transparent) override;
   void setVisible(bool visible) override;
   void setPageScaleFactorAndLimits(float page_scale_factor,
                                    float minimum,
                                    float maximum) override;
@@ skipping 87 matching lines @@
 
   blink::WebLayoutAndPaintAsyncCallback* layout_and_paint_async_callback_;
   scoped_ptr<cc::CopyOutputRequest> temporary_copy_output_request_;
 
   base::WeakPtrFactory<RenderWidgetCompositor> weak_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_H_