Add "Cast..." to overflow and contextual menus.

chrome/browser/ui/browser_commands.cc

Index: chrome/browser/ui/browser_commands.cc
diff --git a/chrome/browser/ui/browser_commands.cc b/chrome/browser/ui/browser_commands.cc
index cb8a4dc1a3bbd9776bbd3d171e4b6b0c7c39b657..f90be0c36d83ff4b07d2ef7409b1d3db46bd440f 100644
--- a/chrome/browser/ui/browser_commands.cc
+++ b/chrome/browser/ui/browser_commands.cc
@@ -17,6 +17,7 @@
 #include "chrome/browser/devtools/devtools_window.h"
 #include "chrome/browser/dom_distiller/tab_utils.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
+#include "chrome/browser/media/router/media_router_dialog_controller.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
 #include "chrome/browser/profiles/profile.h"
@@ -911,6 +912,27 @@ bool CanBasicPrint(Browser* browser) {
 }
 #endif  // ENABLE_BASIC_PRINTING
 
+bool CanRouteMedia(Browser* browser) {
+  if (!switches::MediaRouterEnabled() || browser->profile()->IsOffTheRecord())
+    return false;
+
+  // Do not allow user to open Media Router dialog when there is already an
+  // active modal dialog. This avoids overlapping dialogs.
+  return !IsShowingWebContentsModalDialog(browser);
+}
+
+void RouteMedia(Browser* browser) {
+  DCHECK(CanRouteMedia(browser));
+
+  media_router::MediaRouterDialogController* dialog_controller =
+      media_router::MediaRouterDialogController::GetOrCreateForWebContents(
+          browser->tab_strip_model()->GetActiveWebContents());
+  if (!dialog_controller)
+    return;
+
+  dialog_controller->ShowMediaRouterDialog();
+}
+
 void EmailPageLocation(Browser* browser) {
   content::RecordAction(UserMetricsAction("EmailPageLocation"));
   WebContents* wc = browser->tab_strip_model()->GetActiveWebContents();