[Pepper GL] Use shared state to fix a memory leak in MapSub GL extension.

content/common/gpu/client/command_buffer_proxy_impl.h

 // Copyright (c) 2012 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 CONTENT_COMMON_GPU_CLIENT_COMMAND_BUFFER_PROXY_IMPL_H_
 #define CONTENT_COMMON_GPU_CLIENT_COMMAND_BUFFER_PROXY_IMPL_H_
 
 #include <map>
 #include <queue>
 #include <string>
@@ skipping 123 matching lines @@
   void SetLatencyInfo(const std::vector<ui::LatencyInfo>& latency_info);
 
   // TODO(apatrick): this is a temporary optimization while skia is calling
   // ContentGLContext::MakeCurrent prior to every GL call. It saves returning 6
   // ints redundantly when only the error is needed for the
   // CommandBufferProxyImpl implementation.
   virtual gpu::error::Error GetLastError() OVERRIDE;
 
   GpuChannelHost* channel() const { return channel_; }
 
+  base::SharedMemoryHandle GetSharedStateHandle() const {
+    return shared_state_shm_->handle();
+  }
+
  private:
   typedef std::map<int32, scoped_refptr<gpu::Buffer> > TransferBufferMap;
   typedef base::hash_map<uint32, base::Closure> SignalTaskMap;
   typedef base::ScopedPtrHashMap<int32, gfx::GpuMemoryBuffer>
       GpuMemoryBufferMap;
 
   // Send an IPC message over the GPU channel. This is private to fully
   // encapsulate the channel; all callers of this function must explicitly
   // verify that the context has not been lost.
   bool Send(IPC::Message* msg);
@@ skipping 45 matching lines @@
   GpuMemoryBufferMap gpu_memory_buffers_;
 
   gpu::Capabilities capabilities_;
 
   DISALLOW_COPY_AND_ASSIGN(CommandBufferProxyImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_COMMAND_BUFFER_PROXY_IMPL_H_