Implement parsing/serialization of a=bundle-only.

webrtc/p2p/base/sessiondescription.cc

Index: webrtc/p2p/base/sessiondescription.cc
diff --git a/webrtc/p2p/base/sessiondescription.cc b/webrtc/p2p/base/sessiondescription.cc
index 5320b0596ab47c86ba8398058364c12aa13b82a6..1e69c83e76243da6d0864025624435a2e12d2d01 100644
--- a/webrtc/p2p/base/sessiondescription.cc
+++ b/webrtc/p2p/base/sessiondescription.cc
@@ -132,6 +132,15 @@ void SessionDescription::AddContent(const std::string& name,
   contents_.push_back(ContentInfo(name, type, rejected, description));
 }
 
+void SessionDescription::AddContent(const std::string& name,
+                                    const std::string& type,
+                                    bool rejected,
+                                    bool bundle_only,
+                                    ContentDescription* description) {
+  contents_.push_back(
+      ContentInfo(name, type, rejected, bundle_only, description));
+}
+
 bool SessionDescription::RemoveContentByName(const std::string& name) {
   for (ContentInfos::iterator content = contents_.begin();
        content != contents_.end(); ++content) {