[PresentationAPI] Added on-session-message handler.

content/renderer/presentation/presentation_session_client.cc

 // Copyright 2015 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/renderer/presentation/presentation_session_client.h"
 
 #include "base/logging.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 
 namespace content {
 
 PresentationSessionClient::PresentationSessionClient(
     presentation::PresentationSessionInfoPtr session_info)
     : url_(blink::WebString::fromUTF8(session_info->url)),
       id_(blink::WebString::fromUTF8(session_info->id)) {
 }
 
+PresentationSessionClient::PresentationSessionClient(const mojo::String& url,
+                                                     const mojo::String& id)
+    : url_(blink::WebString::fromUTF8(url)),
+      id_(blink::WebString::fromUTF8(id)) {
+}
+
 PresentationSessionClient::~PresentationSessionClient() {
 }
 
 blink::WebString PresentationSessionClient::getUrl() {
     return url_;
 }
 
 blink::WebString PresentationSessionClient::getId() {
     return id_;
 }
 
 }  // namespace content