add heuristic to pour small pictures into recordings, rather than ref'ing

include/core/SkCanvas.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkCanvas_DEFINED
 #define SkCanvas_DEFINED
 
@@ skipping 933 matching lines @@
         @param paint    The paint used for the text (e.g. color, size, style)
     */
     void drawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y, const SkPaint& paint);
 
     /** Draw the picture into this canvas. This method effective brackets the
         playback of the picture's draw calls with save/restore, so the state
         of this canvas will be unchanged after this call.
         @param picture The recorded drawing commands to playback into this
                        canvas.
     */
-    void drawPicture(const SkPicture* picture);
+    void drawPicture(const SkPicture* picture) {
+        this->drawPicture(picture, NULL, NULL);
+    }
 
     /**
      *  Draw the picture into this canvas.
      *
      *  If matrix is non-null, apply that matrix to the CTM when drawing this picture. This is
      *  logically equivalent to
      *      save/concat/drawPicture/restore
      *
      *  If paint is non-null, draw the picture into a temporary buffer, and then apply the paint's
      *  alpha/colorfilter/imagefilter/xfermode to that buffer as it is drawn to the canvas.
@@ skipping 533 matching lines @@
 
 class SkCanvasClipVisitor {
 public:
     virtual ~SkCanvasClipVisitor();
     virtual void clipRect(const SkRect&, SkRegion::Op, bool antialias) = 0;
     virtual void clipRRect(const SkRRect&, SkRegion::Op, bool antialias) = 0;
     virtual void clipPath(const SkPath&, SkRegion::Op, bool antialias) = 0;
 };
 
 #endif