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

ppapi/shared_impl/ppb_device_ref_shared.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 PPAPI_SHARED_IMPL_PPB_DEVICE_REF_SHARED_H_
 #define PPAPI_SHARED_IMPL_PPB_DEVICE_REF_SHARED_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/thunk/ppb_device_ref_api.h"
 
 namespace ppapi {
 
 // IF YOU ADD STUFF TO THIS CLASS
 // ==============================
 // Be sure to add it to the STRUCT_TRAITS at the top of ppapi_messages.h.
 struct PPAPI_SHARED_EXPORT DeviceRefData {
   DeviceRefData();
 
+  bool operator==(const DeviceRefData& other) const {
+    return type == other.type &&
+           name == other.name &&
+           id == other.id;
+  }
+
   PP_DeviceType_Dev type;
   std::string name;
   std::string id;
 };
 
 class PPAPI_SHARED_EXPORT PPB_DeviceRef_Shared
     : public Resource,
       public thunk::PPB_DeviceRef_API {
  public:
   PPB_DeviceRef_Shared(ResourceObjectType type,
@@ skipping 15 matching lines @@
 
  private:
   DeviceRefData data_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PPB_DeviceRef_Shared);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_PPB_DEVICE_REF_SHARED_H_