Revert of Revert of Revert of Make drawImage a virtual on SkDevice

src/core/SkPaintPriv.cpp

Index: src/core/SkPaintPriv.cpp
diff --git a/src/core/SkPaintPriv.cpp b/src/core/SkPaintPriv.cpp
index 3ced57392934e1f5b6a5fbb993c9c7f7be9acab9..c6957cd1cafe29ba19b76937a3d10999c7680927 100644
--- a/src/core/SkPaintPriv.cpp
+++ b/src/core/SkPaintPriv.cpp
@@ -9,7 +9,6 @@
 
 #include "SkBitmap.h"
 #include "SkColorFilter.h"
-#include "SkImage.h"
 #include "SkPaint.h"
 #include "SkShader.h"
 
@@ -50,8 +49,3 @@
 
     return isPaintOpaque(paint, contentType);
 }
-
-bool isPaintOpaque(const SkPaint* paint, const SkImage* image) {
-    return isPaintOpaque(paint, image->isOpaque() ?
-                         kOpaque_SkPaintBitmapOpacity : kUnknown_SkPaintBitmapOpacity);
-}