Shrink saveLayer device bounds when it supplies an explicit bounds and has a complex paint

src/core/SkRecordDraw.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 SkRecordDraw_DEFINED
 #define SkRecordDraw_DEFINED
 
 #include "SkBBoxHierarchy.h"
 #include "SkCanvas.h"
 #include "SkDrawPictureCallback.h"
 #include "SkMatrix.h"
 #include "SkRecord.h"
 
 // Fill a BBH to be used by SkRecordDraw to accelerate playback.
-void SkRecordFillBounds(const SkRecord&, SkBBoxHierarchy*);
+void SkRecordFillBounds(const SkRect& cullRect, const SkRecord&, SkBBoxHierarchy*);
 
 // Draw an SkRecord into an SkCanvas.  A convenience wrapper around SkRecords::Draw.
 void SkRecordDraw(const SkRecord&, SkCanvas*, const SkBBoxHierarchy*, SkDrawPictureCallback*);
 
 // Draw a portion of an SkRecord into an SkCanvas while replacing clears with drawRects.
 // When drawing a portion of an SkRecord the CTM on the passed in canvas must be
 // the composition of the replay matrix with the record-time CTM (for the portion
 // of the record that is being replayed). For setMatrix calls to behave correctly
 // the initialCTM parameter must set to just the replay matrix.
 void SkRecordPartialDraw(const SkRecord&, SkCanvas*, const SkRect&, unsigned start, unsigned stop,
@@ skipping 38 matching lines @@
     }
 
 private:
     const SkRect fClearRect;
     typedef Draw INHERITED;
 };
 
 }  // namespace SkRecords
 
 #endif//SkRecordDraw_DEFINED