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

chrome/browser/media/router/media_source.cc

Index: chrome/browser/media/router/media_source.cc
diff --git a/chrome/browser/media/router/media_source.cc b/chrome/browser/media/router/media_source.cc
index 87b4d78788759bd58db0d1b8e166dc5903e0011a..5bcd6ae82bf97bbf523e6cb9b358dea1a14cb9ce 100644
--- a/chrome/browser/media/router/media_source.cc
+++ b/chrome/browser/media/router/media_source.cc
@@ -24,6 +24,10 @@ bool MediaSource::Equals(const MediaSource& other) const {
   return id_ == other.id();
 }
 
+bool MediaSource::operator==(const MediaSource& other) const {
+  return id_ == other.id();
+}
+
 bool MediaSource::Empty() const {
   return id_.empty();
 }