Use empty string as the mid before it's ready from WebKit. Label is not the correct mid, so we shou…

content/renderer/media/media_stream_center.cc

Index: content/renderer/media/media_stream_center.cc
===================================================================
--- content/renderer/media/media_stream_center.cc	(revision 149634)
+++ content/renderer/media/media_stream_center.cc	(working copy)
@@ -147,8 +147,10 @@
     LOG(ERROR) << "Invalid candidate label: " << UTF16ToUTF8(candidate.label());
     return WebKit::WebString();
   }
+  // TODO(ronghuawu): Get sdp_mid from WebKit when is available.
+  const std::string sdp_mid;
   scoped_ptr<webrtc::IceCandidateInterface> native_candidate(
-      webrtc::CreateIceCandidate(UTF16ToUTF8(candidate.label()),
+      webrtc::CreateIceCandidate(sdp_mid,
                                  m_line_index,
                                  UTF16ToUTF8(candidate.candidateLine())));
   std::string sdp;
@@ -172,11 +174,16 @@
                  << UTF16ToUTF8(candidate.label());
       continue;
     }
+    // TODO(ronghuawu): Get sdp_mid from WebKit when is available.
+    const std::string sdp_mid;
     scoped_ptr<webrtc::IceCandidateInterface> native_candidate(
-        webrtc::CreateIceCandidate(UTF16ToUTF8(candidate.label()),
+        webrtc::CreateIceCandidate(sdp_mid,
                                    m_line_index,
                                    UTF16ToUTF8(candidate.candidateLine())));
-    native_desc->AddCandidate(native_candidate.get());
+    if (!native_desc->AddCandidate(native_candidate.get())) {
+      LOG(ERROR) << "Failed to add candidate to SessionDescription.";
+      continue;
+    }
   }
 
   std::string sdp;