refactor EnumerateDevices to make it a persistent request.

content/renderer/pepper/pepper_plugin_delegate_impl.cc

 // 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.
 
 #include "content/renderer/pepper/pepper_plugin_delegate_impl.h"
 
 #include <cmath>
 #include <cstddef>
 #include <map>
 #include <queue>
@@ skipping 1488 matching lines @@
   MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(
           &PepperDeviceEnumerationEventHandler::OnDevicesEnumerationFailed,
           device_enumeration_event_handler_->AsWeakPtr(), request_id));
 #endif
 
   return request_id;
 }
 
+void PepperPluginDelegateImpl::StopEnumerateDevices(int request_id) {
+#if defined(ENABLE_WEBRTC)
+  // Need to post task since this function might be called inside the callback
+  // of EnumerateDevices.
+  MessageLoop::current()->PostTask(
+      FROM_HERE,
+      base::Bind(
+          &MediaStreamDispatcher::StopEnumerateDevices,
+          base::Unretained(render_view_->media_stream_dispatcher()),
+          request_id, device_enumeration_event_handler_.get()->AsWeakPtr()));
+#endif
+}
+
 bool PepperPluginDelegateImpl::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(PepperPluginDelegateImpl, message)
     IPC_MESSAGE_HANDLER(PpapiMsg_PPBTCPSocket_ConnectACK,
                         OnTCPSocketConnectACK)
     IPC_MESSAGE_HANDLER(PpapiMsg_PPBTCPSocket_SSLHandshakeACK,
                         OnTCPSocketSSLHandshakeACK)
     IPC_MESSAGE_HANDLER(PpapiMsg_PPBTCPSocket_ReadACK, OnTCPSocketReadACK)
     IPC_MESSAGE_HANDLER(PpapiMsg_PPBTCPSocket_WriteACK, OnTCPSocketWriteACK)
     IPC_MESSAGE_HANDLER(PpapiMsg_PPBUDPSocket_BindACK, OnUDPSocketBindACK)
@@ skipping 245 matching lines @@
   else
     return render_view_->mouse_lock_dispatcher();
 }
 
 webkit_glue::ClipboardClient*
     PepperPluginDelegateImpl::CreateClipboardClient() const {
   return new RendererClipboardClient;
 }
 
 }  // namespace content