Fix memory leak in "Begin atlasing"

src/gpu/GrLayerCache.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrAtlas.h"
 #include "GrGpu.h"
 #include "GrLayerCache.h"
@@ skipping 29 matching lines @@
     uint32_t fPictureID;
     int      fLayerID;
 };
 
 GrLayerCache::GrLayerCache(GrContext* context)
     : fContext(context) {
     this->initAtlas();
 }
 
 GrLayerCache::~GrLayerCache() {
+    this->freeAll();
 }
 
 void GrLayerCache::initAtlas() {
     static const int kAtlasTextureWidth = 1024;
     static const int kAtlasTextureHeight = 1024;
 
     SkASSERT(NULL == fAtlas.get());
 
     // The layer cache only gets 1 plot
     SkISize textureSize = SkISize::Make(kAtlasTextureWidth, kAtlasTextureHeight);
@@ skipping 103 matching lines @@
         }
     }
 
     for (int i = 0; i < toBeRemoved.count(); ++i) {
         this->unlock(toBeRemoved[i]);
 
         PictureLayerKey key(picture->uniqueID(), toBeRemoved[i]->layerID());
         fLayerHash.remove(key, toBeRemoved[i]);
     }
 }