Make GLES2Implementation use a larger chunk size for mapping functions.

gpu/command_buffer/client/mapped_memory.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_MAPPED_MEMORY_H_
 #define GPU_COMMAND_BUFFER_CLIENT_MAPPED_MEMORY_H_
 
 #include <vector>
 
 #include "../common/types.h"
@@ skipping 92 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(MemoryChunk);
 };
 
 // Manages MemoryChucks.
 class MappedMemoryManager {
  public:
   explicit MappedMemoryManager(CommandBufferHelper* helper);
 
   ~MappedMemoryManager();
 
+  unsigned int chunk_size_multiple() const {
+    return chunk_size_multiple_;
+  }
+
+  void set_chunk_size_multiple(unsigned int multiple) {
+    chunk_size_multiple_ = multiple;
+  }
+
   // Allocates a block of memory
   // Parameters:
   //   size: size of memory to allocate.
   //   shm_id: pointer to variable to receive the shared memory id.
   //   shm_offset: pointer to variable to receive the shared memory offset.
   // Returns:
   //   pointer to allocated block of memory. NULL if failure.
   void* Alloc(
       unsigned int size, int32* shm_id, unsigned int* shm_offset);
 
@@ skipping 15 matching lines @@
   void FreeUnused();
 
   // Used for testing
   size_t num_chunks() {
     return chunks_.size();
   }
 
  private:
   typedef std::vector<MemoryChunk*> MemoryChunkVector;
 
+  // size a chunk is rounded up to.
+  unsigned int chunk_size_multiple_;
   CommandBufferHelper* helper_;
   MemoryChunkVector chunks_;
 
   DISALLOW_COPY_AND_ASSIGN(MappedMemoryManager);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_MAPPED_MEMORY_H_