Add different error codes for getUserMedia.

content/browser/web_contents/web_contents_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/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 1567 matching lines @@
     // The view has gone away or the renderer crashed. Nothing to do.
     return NULL;
   }
 
   return widget_host_view;
 }
 
 void WebContentsImpl::RequestMediaAccessPermission(
     const MediaStreamRequest& request,
     const MediaResponseCallback& callback) {
-  if (delegate_)
+  if (delegate_) {
     delegate_->RequestMediaAccessPermission(this, request, callback);
-  else
-    callback.Run(MediaStreamDevices(), scoped_ptr<MediaStreamUI>());
+  } else {
+    callback.Run(MediaStreamDevices(),
+                 MEDIA_DEVICE_INVALID_STATE,
+                 scoped_ptr<MediaStreamUI>());
+  }
 }
 
 SessionStorageNamespace* WebContentsImpl::GetSessionStorageNamespace(
     SiteInstance* instance) {
   return controller_.GetSessionStorageNamespace(instance);
 }
 
 FrameTree* WebContentsImpl::GetFrameTree() {
   return &frame_tree_;
 }
@@ skipping 2019 matching lines @@
 
 void WebContentsImpl::OnPreferredSizeChanged(const gfx::Size& old_size) {
   if (!delegate_)
     return;
   const gfx::Size new_size = GetPreferredSize();
   if (new_size != old_size)
     delegate_->UpdatePreferredSize(this, new_size);
 }
 
 }  // namespace content