[Presentation API] Add support for multiple URLs in PresentationRequest on Media Router UI side

chrome/browser/media/router/presentation_request.h

 // 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.
 
 #ifndef CHROME_BROWSER_MEDIA_ROUTER_PRESENTATION_REQUEST_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_PRESENTATION_REQUEST_H_
 
 #include <string>
+#include <vector>
 
 #include "chrome/browser/media/router/media_source.h"
 #include "chrome/browser/media/router/render_frame_host_id.h"
 #include "url/gurl.h"
 
 namespace media_router {
 
 // Represents a presentation request made from a render frame. Contains the
 // presentation URL of the request, and information on the originating frame.
 class PresentationRequest {
  public:
   PresentationRequest(const RenderFrameHostId& render_frame_host_id,
+                      // TODO(crbug.com/627655): Handle multiple URLs.

[mark a. foltz, 2016/08/31 05:18:54]

Would it be possible to change the ctor to take const std::vector<std::string>&
presentation_urls?  There should be only a couple of invocations of this.

[takumif, 2016/09/01 21:09:25]

Done.

                       const std::string& presentation_url,
                       const GURL& frame_url);
   PresentationRequest(const PresentationRequest& other);
   ~PresentationRequest();
 
   bool Equals(const PresentationRequest& other) const;
 
-  // Helper method to get the MediaSource for |presentation_url_|.
-  MediaSource GetMediaSource() const;
+  // Helper method to get the MediaSources for |presentation_urls_|.
+  std::vector<MediaSource> GetMediaSources() const;
 
   const RenderFrameHostId& render_frame_host_id() const {
     return render_frame_host_id_;
   }
-  const std::string& presentation_url() const { return presentation_url_; }
+  // TODO(crbug.com/627655): Use multiple URLs.
+  const std::string& presentation_url() const { return presentation_urls_[0]; }
   const GURL& frame_url() const { return frame_url_; }
 
  private:
   // ID of RenderFrameHost that initiated the request.
   const RenderFrameHostId render_frame_host_id_;
 
-  // URL of presentation.
-  const std::string presentation_url_;
+  // URLs of presentation.
+  const std::vector<std::string> presentation_urls_;
 
   // URL of frame from which the request was initiated.
   const GURL frame_url_;
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_PRESENTATION_REQUEST_H_