Introduce PPB_AudioInput_Dev v0.3 and refactor the device enumeration code:

content/renderer/pepper/pepper_audio_input_host.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_RENDERER_PEPPER_PEPPER_AUDIO_INPUT_HOST_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_AUDIO_INPUT_HOST_H_
 
 #include <string>
-#include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
 #include "base/shared_memory.h"
 #include "base/sync_socket.h"
+#include "content/renderer/pepper/pepper_device_enumeration_host_helper.h"
 #include "ipc/ipc_platform_file.h"
 #include "ppapi/c/ppb_audio_config.h"
 #include "ppapi/host/host_message_context.h"
 #include "ppapi/host/resource_host.h"
 #include "webkit/plugins/ppapi/plugin_delegate.h"
 
-namespace ppapi {
-struct DeviceRefData;
-}
-
 namespace content {
 
 class RendererPpapiHost;
 
 class PepperAudioInputHost
     : public ppapi::host::ResourceHost,
       public webkit::ppapi::PluginDelegate::PlatformAudioInputClient,
-      public base::SupportsWeakPtr<PepperAudioInputHost> {
+      public PepperDeviceEnumerationHostHelper::Delegate {
  public:
   PepperAudioInputHost(RendererPpapiHost* host,
                        PP_Instance instance,
                        PP_Resource resource);
   virtual ~PepperAudioInputHost();
 
   virtual int32_t OnResourceMessageReceived(
       const IPC::Message& msg,
       ppapi::host::HostMessageContext* context) OVERRIDE;
 
   // PluginDelegate::PlatformAudioInputClient implementation.
   virtual void StreamCreated(base::SharedMemoryHandle shared_memory_handle,
                              size_t shared_memory_size,
                              base::SyncSocket::Handle socket) OVERRIDE;
   virtual void StreamCreationFailed() OVERRIDE;
 
+  // PepperDeviceEnumerationHostHelper::Delegate implementation.
+  virtual webkit::ppapi::PluginDelegate* GetPluginDelegate() OVERRIDE;
+
  private:
-  int32_t OnMsgEnumerateDevices(ppapi::host::HostMessageContext* context);
   int32_t OnMsgOpen(ppapi::host::HostMessageContext* context,
                     const std::string& device_id,
                     PP_AudioSampleRate sample_rate,
                     uint32_t sample_frame_count);
   int32_t OnMsgStartOrStop(ppapi::host::HostMessageContext* context,
                            bool capture);
   int32_t OnMsgClose(ppapi::host::HostMessageContext* context);
 
-  void EnumerateDevicesCallbackFunc(
-      int request_id,
-      bool succeeded,
-      const std::vector<ppapi::DeviceRefData>& devices);
-
   void OnOpenComplete(int32_t result,
                       base::SharedMemoryHandle shared_memory_handle,
                       size_t shared_memory_size,
                       base::SyncSocket::Handle socket_handle);
 
   int32_t GetRemoteHandles(
       const base::SyncSocket& socket,
       const base::SharedMemory& shared_memory,
       IPC::PlatformFileForTransit* remote_socket_handle,
       base::SharedMemoryHandle* remote_shared_memory_handle);
 
   void Close();
 
-  // TODO(yzshen): Move the relevant functionality out of PluginDelegate and get
-  // rid of this method.
-  webkit::ppapi::PluginDelegate* GetDelegate() const;
-
   // Non-owning pointer.
   RendererPpapiHost* renderer_ppapi_host_;
 
-  scoped_ptr<ppapi::host::ReplyMessageContext> enumerate_devices_context_;
   scoped_ptr<ppapi::host::ReplyMessageContext> open_context_;
 
   // PluginDelegate audio input object that we delegate audio IPC through.
   // We don't own this pointer but are responsible for calling Shutdown on it.
   webkit::ppapi::PluginDelegate::PlatformAudioInput* audio_input_;
 
+  PepperDeviceEnumerationHostHelper enumeration_helper_;
+
   DISALLOW_COPY_AND_ASSIGN(PepperAudioInputHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_AUDIO_INPUT_HOST_H_