[Media Router] Handle multiple Presentation URLs when creating routes.

chrome/browser/media/router/media_source_helper.h

Index: chrome/browser/media/router/media_source_helper.h
diff --git a/chrome/browser/media/router/media_source_helper.h b/chrome/browser/media/router/media_source_helper.h
index f9356cd1073a4ca5d04d19b1fb189f407d921159..e936e4620b349dec09fadb97eaf06ad3a797deed 100644
--- a/chrome/browser/media/router/media_source_helper.h
+++ b/chrome/browser/media/router/media_source_helper.h
@@ -29,6 +29,10 @@ bool IsDesktopMirroringMediaSource(const MediaSource& source);
 bool IsTabMirroringMediaSource(const MediaSource& source);
 bool IsMirroringMediaSource(const MediaSource& source);
 
+// Returns true if |source| is a media route type that can be connected to the
+// Presentation API by from a request initiated by the browser.
+bool CanConnectToMediaSource(const MediaSource& source);
+
 // Parses the |source| and returns the SessionTabHelper tab ID referencing a
 // source tab. Returns a non-positive value on error.
 int TabIdFromMediaSource(const MediaSource& source);