Move BitmapPlatformDevice::makeOpaque into a shared file

skia/ext/bitmap_platform_device_mac.h

Index: skia/ext/bitmap_platform_device_mac.h
diff --git a/skia/ext/bitmap_platform_device_mac.h b/skia/ext/bitmap_platform_device_mac.h
index a775a08369d4e3a8d31b8958ba454d1a0fbfdca5..195dca866ae9f6417b4ac76a8daa76339777c0b9 100644
--- a/skia/ext/bitmap_platform_device_mac.h
+++ b/skia/ext/bitmap_platform_device_mac.h
@@ -58,6 +58,7 @@ class BitmapPlatformDevice : public PlatformDevice {
 
   virtual void DrawToContext(CGContextRef context, int x, int y,
                              const CGRect* src_rect);
+  virtual void makeOpaque(int x, int y, int width, int height);
   virtual bool IsVectorial() { return false; }
 
   // Returns the color value at the specified location. This does not
@@ -78,10 +79,6 @@ class BitmapPlatformDevice : public PlatformDevice {
   // starts accessing pixel data.
   virtual void onAccessBitmap(SkBitmap*);
 
-  virtual void processPixels(int x, int y,
-                             int width, int height,
-                             adjustAlpha adjustor);
-
   // Data associated with this device, guaranteed non-null. We hold a reference
   // to this object.
   BitmapPlatformDeviceData* data_;