Tag TransportDIBs with the device scale factor they expect.

content/browser/renderer_host/backing_store_gtk.h

 // Copyright (c) 2011 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_BACKING_STORE_GTK_H_
 #define CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_GTK_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 46 matching lines @@
   void PaintToRect(const gfx::Rect& dest_rect, GdkDrawable* target);
 #endif
 
   // BackingStore implementation.
   virtual size_t MemorySize() OVERRIDE;
   virtual void PaintToBackingStore(
       content::RenderProcessHost* process,
       TransportDIB::Id bitmap,
       const gfx::Rect& bitmap_rect,
       const std::vector<gfx::Rect>& copy_rects,
+      float scale_factor,
       const base::Closure& completion_callback,
       bool* scheduled_completion_callback) OVERRIDE;
   virtual bool CopyFromBackingStore(const gfx::Rect& rect,
                                     skia::PlatformCanvas* output) OVERRIDE;
   virtual void ScrollBackingStore(int dx, int dy,
                                   const gfx::Rect& clip_rect,
                                   const gfx::Size& view_size) OVERRIDE;
 
  private:
   // Paints the bitmap from the renderer onto the backing store without
@@ skipping 21 matching lines @@
   XID pixmap_;
   // This is the RENDER picture pointing at |pixmap_|.
   XID picture_;
   // This is a default graphic context, used in XCopyArea
   void* pixmap_gc_;
 
   DISALLOW_COPY_AND_ASSIGN(BackingStoreGtk);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_GTK_H_