Add additional clean up code in MPD path

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 208 matching lines @@
                 *needsRendering = true;
                 return true;
             }
 
             // The layer was rejected by the atlas (even though we know it is
             // plausibly atlas-able). See if a plot can be purged and try again.
             if (!this->purgePlot()) {
                 break;  // We weren't able to purge any plots
             }
         }
+
+        if (pictInfo->fPlotUsage.isEmpty()) {
+            fPictureHash.remove(pictInfo->fPictureID);
+            SkDELETE(pictInfo);
+        }
     }
 
     return false;
 }
 
 bool GrLayerCache::lock(GrCachedLayer* layer, const GrSurfaceDesc& desc, bool* needsRendering) {
     if (layer->locked()) {
         // This layer is already locked
         *needsRendering = false;
         return true;
@@ skipping 251 matching lines @@
         fileName.appendf("\\%d", layer->fKey.pictureID());
         for (int i = 0; i < layer->fKey.keySize(); ++i) {
             fileName.appendf("-%d", layer->fKey.key()[i]);
         }
         fileName.appendf(".png");
 
         layer->texture()->surfacePriv().savePixels(fileName.c_str());
     }
 }
 #endif