[Presentation API] (alternative) 1-UA: send message between controller and receiver page

content/public/browser/presentation_session.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/public/browser/presentation_session.h"
 
 namespace content {
 
 PresentationSessionInfo::PresentationSessionInfo(
     const GURL& presentation_url,
     const std::string& presentation_id)
-    : presentation_url(presentation_url), presentation_id(presentation_id) {}
+    : PresentationSessionInfo(presentation_url, presentation_id, false) {}
+
+PresentationSessionInfo::PresentationSessionInfo(
+    const GURL& presentation_url,
+    const std::string& presentation_id,
+    bool is_offscreen)
+    : presentation_url(presentation_url),
+      presentation_id(presentation_id),
+      is_offscreen(is_offscreen) {}
 
 PresentationSessionInfo::~PresentationSessionInfo() {
 }
 
 PresentationError::PresentationError(
     PresentationErrorType error_type,
     const std::string& message)
     : error_type(error_type),
       message(message) {
 }
 
 PresentationError::~PresentationError() {
 }
 
 }  // namespace content