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

content/renderer/render_widget.h

 // Copyright (c) 2012 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_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 553 matching lines @@
   void setTouchAction(blink::WebTouchAction touch_action) override;
 
   // Called when value of focused text field gets dirty, e.g. value is modified
   // by script, not by user input.
   void didUpdateTextOfFocusedElementByNonUserInput() override;
 
   // Creates a 3D context associated with this view.
   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> CreateGraphicsContext3D(
       bool compositor);
 
+  // Sets the size of the compositor's viewport to the latest size.
+  //

[danakj, 2015/10/22 23:15:29]

extra lines?

[oshima, 2015/10/23 18:05:37]

Done.

+  //
+  void UpdateCompositorViewportSize();
+
   // Routing ID that allows us to communicate to the parent browser process
   // RenderWidgetHost. When MSG_ROUTING_NONE, no messages may be sent.
   int32 routing_id_;
 
   // Dependencies for initializing a compositor, including flags for optional
   // features.
   CompositorDependencies* const compositor_deps_;
 
   // We are responsible for destroying this object via its Close method.
   // May be NULL when the window is closing.
@@ skipping 204 matching lines @@
   ui::MenuSourceType context_menu_source_type_;
   bool has_host_context_menu_location_;
   gfx::Point host_context_menu_location_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_