support video device enumeration from renderer process.

content/browser/renderer_host/media/media_stream_dispatcher_host.cc

Index: content/browser/renderer_host/media/media_stream_dispatcher_host.cc
===================================================================
--- content/browser/renderer_host/media/media_stream_dispatcher_host.cc	(revision 118766)
+++ content/browser/renderer_host/media/media_stream_dispatcher_host.cc	(working copy)
@@ -44,6 +44,10 @@
     IPC_MESSAGE_HANDLER(MediaStreamHostMsg_GenerateStream, OnGenerateStream)
     IPC_MESSAGE_HANDLER(MediaStreamHostMsg_StopGeneratedStream,
                         OnStopGeneratedStream)
+    IPC_MESSAGE_HANDLER(MediaStreamHostMsg_EnumerateDevices,
+                        OnEnumerateDevices)
+    IPC_MESSAGE_HANDLER(MediaStreamHostMsg_OpenDevice,
+                        OnOpenDevice)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP_EX()
   return handled;
@@ -102,6 +106,44 @@
   streams_.erase(it);
 }
 
+void MediaStreamDispatcherHost::OnEnumerateDevices(
+    int render_view_id,
+    int page_request_id,
+    media_stream::MediaStreamType type,
+    const std::string& security_origin) {
+  DVLOG(1) << "MediaStreamDispatcherHost::OnEnumerateDevices("
+           << render_view_id << ", "
+           << page_request_id << ", "
+           << type << ", "
+           << security_origin << ")";
+
+  std::string label;
+  manager()->EnumerateDevices(this, render_process_id_, render_view_id,
+                              type, security_origin, &label);
+  DCHECK(!label.empty());
+  streams_[label] = StreamRequest(render_view_id, page_request_id);
+}
+
+void MediaStreamDispatcherHost::OnOpenDevice(
+    int render_view_id,
+    int page_request_id,
+    const std::string& device_id,
+    media_stream::MediaStreamType type,
+    const std::string& security_origin) {
+  DVLOG(1) << "MediaStreamDispatcherHost::OnOpenDevice("
+           << render_view_id << ", "
+           << page_request_id << ", device_id: "
+           << device_id.c_str() << ", type: "
+           << type << ", "
+           << security_origin << ")";
+
+  std::string label;
+  manager()->OpenDevice(this, render_process_id_, render_view_id,
+                        device_id, type, security_origin, &label);
+  DCHECK(!label.empty());
+  streams_[label] = StreamRequest(render_view_id, page_request_id);
+}
+
 void MediaStreamDispatcherHost::StreamGenerated(
     const std::string& label,
     const StreamDeviceInfoArray& audio_devices,
@@ -162,4 +204,65 @@
                                                 index));
 }
 
+void MediaStreamDispatcherHost::DevicesEnumerated(
+    const std::string& label,
+    const StreamDeviceInfoArray& devices) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  DVLOG(1) << "MediaStreamDispatcherHost::DevicesEnumerated("
+           << ", {label = " << label <<  "})";
+
+  StreamMap::iterator it = streams_.find(label);
+  DCHECK(it != streams_.end());
+  StreamRequest request = it->second;
+  streams_.erase(it);
+
+  Send(new MediaStreamMsg_DevicesEnumerated(
+      request.render_view_id, request.page_request_id, devices));
+}
+
+void MediaStreamDispatcherHost::DevicesEnumerationFailed(
+    const std::string& label) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  DVLOG(1) << "MediaStreamDispatcherHost::DevicesEnumerationFailed("
+           << ", {label = " << label <<  "})";
+
+  StreamMap::iterator it = streams_.find(label);
+  DCHECK(it != streams_.end());
+  StreamRequest request = it->second;
+  streams_.erase(it);
+
+  Send(new MediaStreamMsg_DevicesEnumerationFailed(
+      request.render_view_id, request.page_request_id));
+}
+
+void MediaStreamDispatcherHost::DeviceOpened(
+    const std::string& label,
+    const StreamDeviceInfo& video_device) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  DVLOG(1) << "MediaStreamDispatcherHost::DeviceOpened("
+           << ", {label = " << label <<  "})";
+
+  StreamMap::iterator it = streams_.find(label);
+  DCHECK(it != streams_.end());
+  StreamRequest request = it->second;
+
+  Send(new MediaStreamMsg_DeviceOpened(
+      request.render_view_id, request.page_request_id, label, video_device));
+}
+
+void MediaStreamDispatcherHost::DeviceOpenFailed(
+    const std::string& label) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  DVLOG(1) << "MediaStreamDispatcherHost::DeviceOpenFailed("
+           << ", {label = " << label <<  "})";
+
+  StreamMap::iterator it = streams_.find(label);
+  DCHECK(it != streams_.end());
+  StreamRequest request = it->second;
+  streams_.erase(it);
+
+  Send(new MediaStreamMsg_DeviceOpenFailed(request.render_view_id,
+                                           request.page_request_id));
+}
+
 }  // namespace media_stream