Add UMA for register protocol handler.

chrome/browser/ui/tab_contents/tab_contents_wrapper.cc

Index: chrome/browser/ui/tab_contents/tab_contents_wrapper.cc
diff --git a/chrome/browser/ui/tab_contents/tab_contents_wrapper.cc b/chrome/browser/ui/tab_contents/tab_contents_wrapper.cc
index 438c02159ea10aeb831ee54b3e54deffdcf85c59..2feae9a569756027cec25a0d9c9d7a5c12393222 100644
--- a/chrome/browser/ui/tab_contents/tab_contents_wrapper.cc
+++ b/chrome/browser/ui/tab_contents/tab_contents_wrapper.cc
@@ -61,6 +61,7 @@
 #include "content/browser/tab_contents/navigation_details.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "content/browser/tab_contents/tab_contents_view.h"
+#include "content/browser/user_metrics.h"
 #include "content/common/notification_service.h"
 #include "content/common/view_messages.h"
 #include "grit/generated_resources.h"
@@ -581,6 +582,8 @@ void TabContentsWrapper::OnRegisterProtocolHandler(const std::string& protocol,
 
   if (!handler.IsEmpty() &&
       registry->CanSchemeBeOverridden(handler.protocol())) {
+    UserMetrics::RecordAction(UserMetricsAction(
+        "RegisterProtocolHandler.InfoBar_Shown"));
     AddInfoBar(new RegisterProtocolHandlerInfoBarDelegate(tab_contents(),
                                                           registry,
                                                           handler));