Update use of SkCanvas and SkDevice to match change in Skia

skia/ext/bitmap_platform_device_linux.h

Index: skia/ext/bitmap_platform_device_linux.h
diff --git a/skia/ext/bitmap_platform_device_linux.h b/skia/ext/bitmap_platform_device_linux.h
index 1c6579cc15fba7358e3c0599057306e09b11753d..daea4c413039c2ee561d3fc8de5f243766ef5f4e 100644
--- a/skia/ext/bitmap_platform_device_linux.h
+++ b/skia/ext/bitmap_platform_device_linux.h
@@ -43,6 +43,12 @@ typedef struct _cairo_surface cairo_surface_t;
 
 namespace skia {
 
+class SkBitmapPlatformDeviceFactory : public SkRasterDeviceFactory {
+ public:
+  virtual SkDevice* newDevice(SkBitmap::Config config, int width, int height,
+                              bool isOpaque, bool isForLayer);
+};
+
 // -----------------------------------------------------------------------------
 // This is the Linux bitmap backing for Skia. We create a Cairo image surface
 // to store the backing buffer. This buffer is BGRA in memory (on little-endian
@@ -79,6 +85,10 @@ class BitmapPlatformDevice : public PlatformDevice {
   // A stub copy constructor.  Needs to be properly implemented.
   BitmapPlatformDevice(const BitmapPlatformDevice& other);
 
+  virtual SkDeviceFactory* getDeviceFactory() {
+    return SkNEW(SkBitmapPlatformDeviceFactory);
+  }
+
   virtual void makeOpaque(int x, int y, int width, int height);
 
   // Bitmaps aren't vector graphics.