text: // Copyright (c) 2013 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 CHROME_RENDERER_PEPPER_PEPPER_SHARED_MEMORY_MESSAGE_FILTER_H_
  #define CHROME_RENDERER_PEPPER_PEPPER_SHARED_MEMORY_MESSAGE_FILTER_H_
  
  #include "ppapi/c/pp_instance.h"
  #include "ppapi/host/instance_message_filter.h"
  
  namespace content {
  class RendererPpapiHost;
  }
  
  namespace ppapi {
  namespace proxy {
  class SerializedHandle;
  }
  }  // namespace ppapi
  
  // Implements the backend for shared memory messages from a plugin process.
  class PepperSharedMemoryMessageFilter
      : public ppapi::host::InstanceMessageFilter {
   public:
    explicit PepperSharedMemoryMessageFilter(content::RendererPpapiHost* host);
    ~PepperSharedMemoryMessageFilter() override;
  
    // InstanceMessageFilter:
    bool OnInstanceMessageReceived(const IPC::Message& msg) override;
  
    bool Send(IPC::Message* msg);
  
   private:
    // Message handlers.
    void OnHostMsgCreateSharedMemory(
        PP_Instance instance,
        uint32_t size,
        int* host_shm_handle_id,
        ppapi::proxy::SerializedHandle* plugin_shm_handle);
  
    content::RendererPpapiHost* host_;
  
    DISALLOW_COPY_AND_ASSIGN(PepperSharedMemoryMessageFilter);
  };
  
  #endif  // CHROME_RENDERER_PEPPER_PEPPER_SHARED_MEMORY_MESSAGE_FILTER_H_
  