Change the scale factor of texture_size from the layer's one to an estimation.

content/browser/renderer_host/render_widget_host_view_aura.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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 306 matching lines @@
 
   // The current composition character bounds.
   std::vector<gfx::Rect> composition_character_bounds_;
 
   // Indicates if there is onging composition text.
   bool has_composition_text_;
 
   // Current tooltip text.
   string16 tooltip_;
 
+  // The scale factor of the device.

[oshima, 2012/09/21 04:32:04]

nit: .. of the display the renderer is currently on.

[Jun Mukai, 2012/09/21 18:25:47]

Done.

+  float device_scale_factor_;
+
   std::vector< base::Callback<void(ui::Compositor*)> >
       on_compositing_did_commit_callbacks_;
 
   std::vector< base::Callback<void(ui::Compositor*)> >
       on_compositing_will_start_callbacks_;
 
   std::map<uint64, scoped_refptr<ui::Texture> >
       image_transport_clients_;
 
   uint64 current_surface_;
@@ skipping 47 matching lines @@
 
   // This lock is for waiting for a front surface to become available to draw.
   scoped_refptr<aura::CompositorLock> released_front_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_