Add GrLayerCache::writeLayersToDisk

src/gpu/GrLayerCache.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 GrLayerCache_DEFINED
 #define GrLayerCache_DEFINED
 
@@ skipping 204 matching lines @@
     }
 
     // Setup to be notified when 'picture' is deleted
     void trackPicture(const SkPicture* picture);
 
     // Cleanup after any SkPicture deletions
     void processDeletedPictures();
 
     SkDEBUGCODE(void validate() const;)
 
+#ifdef SK_DEVELOPER
+    void writeLayersToDisk(const SkString& dirName);
+#endif
+
 private:
     static const int kAtlasTextureWidth = 1024;
     static const int kAtlasTextureHeight = 1024;
 
     static const int kNumPlotsX = 2;
     static const int kNumPlotsY = 2;
 
     static const int kPlotWidth = kAtlasTextureWidth / kNumPlotsX;
     static const int kPlotHeight = kAtlasTextureHeight / kNumPlotsY;
 
@@ skipping 48 matching lines @@
         SkASSERT(fPlotLocks[plotIdx] > 0);
         --fPlotLocks[plotIdx];
     }
 
     // for testing
     friend class TestingAccess;
     int numLayers() const { return fLayerHash.count(); }
 };
 
 #endif