[MediaRouter] Add implementation of PresentationServiceDelegate

chrome/browser/media/router/presentation_helper.cc

Index: chrome/browser/media/router/presentation_helper.cc
diff --git a/chrome/browser/media/router/media_route_id.h b/chrome/browser/media/router/presentation_helper.cc
similarity index 50%
copy from chrome/browser/media/router/media_route_id.h
copy to chrome/browser/media/router/presentation_helper.cc
index 7bdfb57415459a7a00cb5822d92f6e4897607def..bfd84dde962fc348b12e3e38214fb4ee5749e748 100644
--- a/chrome/browser/media/router/media_route_id.h
+++ b/chrome/browser/media/router/presentation_helper.cc
@@ -2,15 +2,15 @@
 // 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_MEDIA_ROUTE_ID_H_
-#define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTE_ID_H_
+#include "chrome/browser/media/router/presentation_helper.h"
 
-#include <string>
+#include "url/gurl.h"
 
 namespace media_router {
 
-using MediaRouteId = std::string;
+bool IsValidPresentationUrl(const std::string& url) {
+  GURL gurl(url);
+  return gurl.is_valid() && gurl.SchemeIsHTTPOrHTTPS();
+}
 
 }  // namespace media_router
-
-#endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTE_ID_H_