Removal of dependencies on PlatformDevice classes.

skia/ext/platform_device_linux.h

Index: skia/ext/platform_device_linux.h
===================================================================
--- skia/ext/platform_device_linux.h	(revision 86706)
+++ skia/ext/platform_device_linux.h	(working copy)
@@ -6,10 +6,9 @@
 #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.
@@ -26,6 +25,12 @@
   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);