Reland of Adding PeerConnectionInterface::SetConfiguration method.

talk/app/webrtc/peerconnectioninterface.h

Index: talk/app/webrtc/peerconnectioninterface.h
diff --git a/talk/app/webrtc/peerconnectioninterface.h b/talk/app/webrtc/peerconnectioninterface.h
index 734c2d09d3915db1adbc9e93d5d6218c7ecef62f..f301bafdff54f672f3f3da501d8965b934e78405 100644
--- a/talk/app/webrtc/peerconnectioninterface.h
+++ b/talk/app/webrtc/peerconnectioninterface.h
@@ -379,8 +379,22 @@ class PeerConnectionInterface : public rtc::RefCountInterface {
                                     SessionDescriptionInterface* desc) = 0;
   // Restarts or updates the ICE Agent process of gathering local candidates
   // and pinging remote candidates.
+  // TODO(deadbeef): Remove once Chrome is moved over to SetConfiguration.
   virtual bool UpdateIce(const IceServers& configuration,
-                         const MediaConstraintsInterface* constraints) = 0;
+                         const MediaConstraintsInterface* constraints) {
+    return false;
+  }
+  // Sets the PeerConnection's global configuration to |config|.
+  // Any changes to STUN/TURN servers or ICE candidate policy will affect the
+  // next gathering phase, and cause the next call to createOffer to generate
+  // new ICE credentials. Note that the BUNDLE and RTCP-multiplexing policies
+  // cannot be changed with this method.
+  // TODO(deadbeef): Make this pure virtual once all Chrome subclasses of
+  // PeerConnectionInterface implement it.
+  virtual bool SetConfiguration(
+      const PeerConnectionInterface::RTCConfiguration& config) {
+    return false;
+  }
   // Provides a remote candidate to the ICE Agent.
   // A copy of the |candidate| will be created and added to the remote
   // description. So the caller of this method still has the ownership of the