Use calloc to allocate data that will be uploaded to vertex/index buffers in Chrome

src/gpu/GrBufferAllocPool.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrBufferAllocPool_DEFINED
 #define GrBufferAllocPool_DEFINED
 
@@ skipping 89 matching lines @@
 private:
     struct BufferBlock {
         size_t              fBytesFree;
         GrGeometryBuffer*   fBuffer;
     };
 
     bool createBlock(size_t requestSize);
     void destroyBlock();
     void deleteBlocks();
     void flushCpuData(const BufferBlock& block, size_t flushSize);
+    void* resetCpuData(size_t newSize);
 #ifdef SK_DEBUG
     void validate(bool unusedBlockAllowed = false) const;
 #endif
-
     size_t                          fBytesInUse;
 
     GrGpu*                          fGpu;
     size_t                          fMinBlockSize;
     BufferType                      fBufferType;
 
     SkTArray<BufferBlock>           fBlocks;
-    SkAutoMalloc                    fCpuData;
+    void*                           fCpuData;
     void*                           fBufferPtr;
     size_t                          fGeometryBufferMapThreshold;
 };
 
 class GrVertexBuffer;
 
 /**
  * A GrBufferAllocPool of vertex buffers
  */
 class GrVertexBufferAllocPool : public GrBufferAllocPool {
@@ skipping 69 matching lines @@
      */
     void* makeSpace(int indexCount,
                     const GrIndexBuffer** buffer,
                     int* startIndex);
 
 private:
     typedef GrBufferAllocPool INHERITED;
 };
 
 #endif