Change signature of SkSpecialImage::draw to take SkScalars

src/core/SkSpecialSurface.h

Index: src/core/SkSpecialSurface.h
diff --git a/src/core/SkSpecialSurface.h b/src/core/SkSpecialSurface.h
index 2751c4a794deef916f1c9fa6dd1c5acf4b5bd6c4..216ef3f41e86bb2914a067a37e07bd59e2f833c3 100644
--- a/src/core/SkSpecialSurface.h
+++ b/src/core/SkSpecialSurface.h
@@ -45,6 +45,8 @@ public:
     *  Returns an image of the current state of the surface pixels up to this
     *  point. The canvas returned by 'getCanvas' becomes invalidated by this
     *  call and no more drawing to this surface is allowed.
+    *
+    *  Note: the caller inherits a ref from this call that must be balanced
     */
     SkSpecialImage* newImageSnapshot();