Fix memory leak in GPU Picture optimization

src/gpu/GrPictureUtils.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 GrPictureUtils_DEFINED
 #define GrPictureUtils_DEFINED
 
@@ skipping 27 matching lines @@
         size_t  fRestoreOpID;
         // True if this saveLayer has at least one other saveLayer nested within it.
         // False otherwise.
         bool    fHasNestedLayers;
         // True if this saveLayer is nested within another. False otherwise.
         bool    fIsNested;
     };
 
     GPUAccelData(Key key) : INHERITED(key) { }
 
+    virtual ~GPUAccelData() {
+        for (int i = 0; i < fSaveLayerInfo.count(); ++i) {
+            SkDELETE(fSaveLayerInfo[i].fPaint);
+        }
+    }
+
     void addSaveLayerInfo(const SaveLayerInfo& info) {
         SkASSERT(info.fSaveLayerOpID < info.fRestoreOpID);
         *fSaveLayerInfo.push() = info;
     }
 
     int numSaveLayers() const { return fSaveLayerInfo.count(); }
 
     const SaveLayerInfo& saveLayerInfo(int index) const {
         SkASSERT(index < fSaveLayerInfo.count());
 
         return fSaveLayerInfo[index];
     }
 
     // We may, in the future, need to pass in the GPUDevice in order to
     // incorporate the clip and matrix state into the key
     static SkPicture::AccelData::Key ComputeAccelDataKey();
 
 protected:
     SkTDArray<SaveLayerInfo> fSaveLayerInfo;
 
 private:
     typedef SkPicture::AccelData INHERITED;
 };
 
 void GatherGPUInfo(SkPicture* pict, GPUAccelData* accelData);
 
 #endif // GrPictureUtils_DEFINED