add matrix options to drawDrawable

include/core/SkDrawable.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDrawable_DEFINED
 #define SkDrawable_DEFINED
 
@@ skipping 12 matching lines @@
  */
 class SkDrawable : public SkRefCnt {
 public:
     SkDrawable();
 
     /**
      *  Draws into the specified content. The drawing sequence will be balanced upon return
      *  (i.e. the saveLevel() on the canvas will match what it was when draw() was called,
      *  and the current matrix and clip settings will not be changed.
      */
-    void draw(SkCanvas*);
+    void draw(SkCanvas*, const SkMatrix* = NULL);
+    void draw(SkCanvas*, SkScalar x, SkScalar y);
 
     SkPicture* newPictureSnapshot();
 
     /**
      *  Return a unique value for this instance. If two calls to this return the same value,
      *  it is presumed that calling the draw() method will render the same thing as well.
      *
      *  Subclasses that change their state should call notifyDrawingChanged() to ensure that
      *  a new value will be returned the next time it is called.
      */
@@ skipping 23 matching lines @@
      *  of their drawable. Note: this picture must draw the same as what would be drawn from
      *  onDraw().
      */
     virtual SkPicture* onNewPictureSnapshot();
 
 private:
     int32_t fGenerationID;
 };
 
 #endif