pre-land special methods on device

include/core/SkBitmapDevice.h

Index: include/core/SkBitmapDevice.h
diff --git a/include/core/SkBitmapDevice.h b/include/core/SkBitmapDevice.h
index f8cc5bec7a21c5c1ad0c16dbafdc172e8bdd9442..b62a88b47f114498446856a6acbe0e0fe06751c4 100644
--- a/include/core/SkBitmapDevice.h
+++ b/include/core/SkBitmapDevice.h
@@ -122,6 +122,13 @@ protected:
     virtual void drawDevice(const SkDraw&, SkBaseDevice*, int x, int y, const SkPaint&) override;
 
     ///////////////////////////////////////////////////////////////////////////
+    
+    void drawSpecial(const SkDraw&, SkSpecialImage*, int x, int y, const SkPaint&) override;
+    sk_sp<SkSpecialImage> makeSpecial(const SkBitmap&) override;
+    sk_sp<SkSpecialImage> makeSpecial(const SkImage*) override;
+    sk_sp<SkSpecialImage> snapSpecial() override;
+
+    ///////////////////////////////////////////////////////////////////////////
 
     /** Update as needed the pixel value in the bitmap, so that the caller can
         access the pixels directly. Note: only the pixels field should be