Change the cpp wrappers of audio input/video capture to use CompletionCallbackWithOutput.

ppapi/cpp/dev/video_capture_dev.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_CPP_DEV_VIDEO_CAPTURE_DEV_H_
 #define PPAPI_CPP_DEV_VIDEO_CAPTURE_DEV_H_
 
 #include <vector>
 
 #include "ppapi/c/dev/pp_video_capture_dev.h"
+#include "ppapi/cpp/completion_callback.h"
+#include "ppapi/cpp/dev/device_ref_dev.h"
 #include "ppapi/cpp/resource.h"
 
 namespace pp {
 
-class CompletionCallback;
-class DeviceRef_Dev;
 class InstanceHandle;
 
 class VideoCapture_Dev : public Resource {
  public:
   explicit VideoCapture_Dev(const InstanceHandle& instance);
   VideoCapture_Dev(PP_Resource resource);
-  VideoCapture_Dev(const VideoCapture_Dev& other);
 
   virtual ~VideoCapture_Dev();
 
-  VideoCapture_Dev& operator=(const VideoCapture_Dev& other);
-
   // Returns true if the required interface is available.
   static bool IsAvailable();
 
-  // |devices| must stay alive until either this VideoCapture_Dev object goes
-  // away or |callback| is run.
-  int32_t EnumerateDevices(std::vector<DeviceRef_Dev>* devices,
-                           const CompletionCallback& callback);
+  int32_t EnumerateDevices(
+      const CompletionCallbackWithOutput<std::vector<DeviceRef_Dev> >&
+          callback);
   int32_t Open(const DeviceRef_Dev& device_ref,
                const PP_VideoCaptureDeviceInfo_Dev& requested_info,
                uint32_t buffer_count,
                const CompletionCallback& callback);
   int32_t StartCapture();
   int32_t ReuseBuffer(uint32_t buffer);
   int32_t StopCapture();
   void Close();
 
  private:
-  struct EnumerateDevicesState;
+  // Heap-allocated data passed to the CallbackConverter for backward
+  // compatibility.
+  struct EnumerateCallbackData0_2 {
+    PP_Resource devices;
+    PP_ArrayOutput output;
+    PP_CompletionCallback original_callback;
+  };
 
-  void AbortEnumerateDevices();
-
-  // |user_data| is an EnumerateDevicesState object. It is this method's
-  // responsibility to delete it.
-  static void OnEnumerateDevicesComplete(void* user_data, int32_t result);
-
-  // Not owned by this object.
-  EnumerateDevicesState* enum_state_;
+  // This is an adapter to convert the v0.2 EnumerateDevices oputput, which is a
+  // PPB_ResourceArray_Dev resource, to PP_ArrayOutput that the caller is
+  // expecting.
+  //
+  // This takes a heap-allocated EnumerateCallbackData0_2 struct passed as the
+  // user data and deletes it when the call completes.
+  static void CallbackConverter(void* user_data, int32_t result);
 
   // Used to store the arguments of Open() when using the v0.1 interface.
   PP_VideoCaptureDeviceInfo_Dev requested_info_;
   uint32_t buffer_count_;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_VIDEO_CAPTURE_DEV_H_