Implement getMediaDevices.

content/browser/renderer_host/media/media_stream_dispatcher_host.cc

Index: content/browser/renderer_host/media/media_stream_dispatcher_host.cc
diff --git a/content/browser/renderer_host/media/media_stream_dispatcher_host.cc b/content/browser/renderer_host/media/media_stream_dispatcher_host.cc
index 51b3395be23a91b8da3da063fe6c5bda2e05de11..78372bb57b898774451f06f8c8c5c480feea543e 100644
--- a/content/browser/renderer_host/media/media_stream_dispatcher_host.cc
+++ b/content/browser/renderer_host/media/media_stream_dispatcher_host.cc
@@ -16,11 +16,13 @@ namespace content {
 MediaStreamDispatcherHost::MediaStreamDispatcherHost(
     int render_process_id,
     const ResourceContext::SaltCallback& salt_callback,
-    MediaStreamManager* media_stream_manager)
+    MediaStreamManager* media_stream_manager,
+    ResourceContext* resource_context)
     : BrowserMessageFilter(MediaStreamMsgStart),
       render_process_id_(render_process_id),
       salt_callback_(salt_callback),
-      media_stream_manager_(media_stream_manager) {
+      media_stream_manager_(media_stream_manager),
+      resource_context_(resource_context) {
 }
 
 void MediaStreamDispatcherHost::StreamGenerated(
@@ -178,9 +180,15 @@ void MediaStreamDispatcherHost::OnEnumerateDevices(
   if (!IsURLAllowed(security_origin))
     return;
 
+  DCHECK(type == MEDIA_DEVICE_AUDIO_CAPTURE ||
+         type == MEDIA_DEVICE_VIDEO_CAPTURE);
+  bool have_permission = type == MEDIA_DEVICE_AUDIO_CAPTURE ?
+      resource_context_->AllowMicAccess(security_origin) :
+      resource_context_->AllowCameraAccess(security_origin);
+
   media_stream_manager_->EnumerateDevices(
       this, render_process_id_, render_view_id, salt_callback_,
-      page_request_id, type, security_origin);
+      page_request_id, type, security_origin, have_permission);
 }
 
 void MediaStreamDispatcherHost::OnCancelEnumerateDevices(