Removal of dependencies on PlatformDevice classes.

skia/ext/platform_device_linux.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 SKIA_EXT_PLATFORM_DEVICE_LINUX_H_
 #define SKIA_EXT_PLATFORM_DEVICE_LINUX_H_
 #pragma once
 
+#include "skia/ext/platform_device.h"
 #include "third_party/skia/include/core/SkDevice.h"
 
-typedef struct _cairo cairo_t;
-
 namespace skia {
 
 // Blindly copying the mac hierarchy.
 class PlatformDevice : public SkDevice {
  public:
   typedef cairo_t* PlatformSurface;
 
   // Returns if the preferred rendering engine is vectorial or bitmap based.
   virtual bool IsVectorial() = 0;
 
   // Returns if native platform APIs are allowed to render text to this device.
   virtual bool IsNativeFontRenderingAllowed();
 
   virtual PlatformSurface BeginPlatformPaint() = 0;
   virtual void EndPlatformPaint();
 
+  virtual void DrawToNativeContext(PlatformSurface surface, int x, int y,
+                                   const PlatformRect* src_rect );
+                                   
+  // Sets the opacity of each pixel in the specified region to be opaque.
+  virtual void MakeOpaque(int x, int y, int width, int height) { }
+
  protected:
   // Forwards |bitmap| to SkDevice's constructor.
   explicit PlatformDevice(const SkBitmap& bitmap);
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_PLATFORM_DEVICE_LINUX_H_