Add UMA for register protocol handler.

chrome/browser/tab_contents/render_view_context_menu.cc

Index: chrome/browser/tab_contents/render_view_context_menu.cc
diff --git a/chrome/browser/tab_contents/render_view_context_menu.cc b/chrome/browser/tab_contents/render_view_context_menu.cc
index d02f69d183ef73e409e3620ebde1947b0faf16fb..cf38b67e0cd3ad50c8986bb79ed735c00531b591 100644
--- a/chrome/browser/tab_contents/render_view_context_menu.cc
+++ b/chrome/browser/tab_contents/render_view_context_menu.cc
@@ -1356,6 +1356,8 @@ void RenderViewContextMenu::ExecuteCommand(int id) {
     if (handlers.empty()) {
       return;
     }
+    UserMetrics::RecordAction(UserMetricsAction(
+        "RegisterProtocolHandler.ContextMenu_Open"));
     int handlerIndex = id - IDC_CONTENT_CONTEXT_PROTOCOL_HANDLER_FIRST;
     OpenURL(
         handlers[handlerIndex].TranslateUrl(params_.link_url),
@@ -1678,6 +1680,8 @@ void RenderViewContextMenu::ExecuteCommand(int id) {
       break;
 #endif  // OS_MACOSX
     case IDC_CONTENT_CONTEXT_PROTOCOL_HANDLER_SETTINGS: {
+      UserMetrics::RecordAction(UserMetricsAction(
+          "RegisterProtocolHandler.ContextMenu_Settings"));
       std::string url = std::string(chrome::kChromeUISettingsURL) +
           chrome::kHandlerSettingsSubPage;
       OpenURL(GURL(url), GURL(), 0, NEW_FOREGROUND_TAB, PageTransition::LINK);