Update use of SkCanvas and SkDevice to match change in Skia

skia/ext/bitmap_platform_device_win.h

Index: skia/ext/bitmap_platform_device_win.h
diff --git a/skia/ext/bitmap_platform_device_win.h b/skia/ext/bitmap_platform_device_win.h
index 059b600f121232813c589d10a761b5f03fb3fbe0..74806b5e52d37a79ad19b002c66cc16faa9ff29b 100644
--- a/skia/ext/bitmap_platform_device_win.h
+++ b/skia/ext/bitmap_platform_device_win.h
@@ -10,6 +10,12 @@
 
 namespace skia {
 
+class SkBitmapPlatformDeviceFactory : public SkRasterDeviceFactory {
+ public:
+  virtual SkDevice* newDevice(SkBitmap::Config config, int width, int height,
+                              bool isOpaque, bool isForLayer);
+};
+
 // A device is basically a wrapper around SkBitmap that provides a surface for
 // SkCanvas to draw into. Our device provides a surface Windows can also write
 // to. BitmapPlatformDevice creates a bitmap using CreateDIBSection() in a
@@ -62,6 +68,10 @@ class BitmapPlatformDevice : public PlatformDevice {
   // See warning for copy constructor above.
   BitmapPlatformDevice& operator=(const BitmapPlatformDevice& other);
 
+  virtual SkDeviceFactory* getDeviceFactory() {
+    return SkNEW(SkBitmapPlatformDeviceFactory);
+  }
+
   // Retrieves the bitmap DC, which is the memory DC for our bitmap data. The
   // bitmap DC is lazy created.
   virtual HDC getBitmapDC();