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

chrome/browser/media/router/presentation_request.cc

Index: chrome/browser/media/router/presentation_request.cc
diff --git a/chrome/browser/media/router/presentation_request.cc b/chrome/browser/media/router/presentation_request.cc
index 396fdf0f353d40b2901e03689562dd747ffb81f2..62aa3cb883bf73e4d4be6fce8bd31e5467c26300 100644
--- a/chrome/browser/media/router/presentation_request.cc
+++ b/chrome/browser/media/router/presentation_request.cc
@@ -13,7 +13,7 @@ PresentationRequest::PresentationRequest(
     const std::string& presentation_url,
     const GURL& frame_url)
     : render_frame_host_id_(render_frame_host_id),
-      presentation_url_(presentation_url),
+      presentation_urls_({presentation_url}),
       frame_url_(frame_url) {}
 
 PresentationRequest::PresentationRequest(const PresentationRequest& other) =
@@ -23,12 +23,15 @@ PresentationRequest::~PresentationRequest() = default;
 
 bool PresentationRequest::Equals(const PresentationRequest& other) const {
   return render_frame_host_id_ == other.render_frame_host_id_ &&
-         presentation_url_ == other.presentation_url_ &&
+         presentation_urls_ == other.presentation_urls_ &&
          frame_url_ == other.frame_url_;
 }
 
-MediaSource PresentationRequest::GetMediaSource() const {
-  return MediaSourceForPresentationUrl(presentation_url_);
+std::vector<MediaSource> PresentationRequest::GetMediaSources() const {
+  std::vector<MediaSource> sources;
+  for (const std::string& presentation_url : presentation_urls_)
+    sources.push_back(MediaSourceForPresentationUrl(presentation_url));
+  return sources;
 }
 
 }  // namespace media_router