Added uma for pin unlock set up.

chrome/browser/ui/webui/settings/people_handler.cc

Index: chrome/browser/ui/webui/settings/people_handler.cc
diff --git a/chrome/browser/ui/webui/settings/people_handler.cc b/chrome/browser/ui/webui/settings/people_handler.cc
index 9a932ad7575db0b692b1bad9aaa7da30dc0185ab..8379278c6b64590081446dd1f5268a3e5d12a0ea 100644
--- a/chrome/browser/ui/webui/settings/people_handler.cc
+++ b/chrome/browser/ui/webui/settings/people_handler.cc
@@ -30,6 +30,7 @@
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/singleton_tabs.h"
 #include "chrome/browser/ui/user_manager.h"
+#include "chrome/browser/ui/webui/metrics_handler.h"
 #include "chrome/browser/ui/webui/profile_helper.h"
 #include "chrome/browser/ui/webui/signin/login_ui_service.h"
 #include "chrome/browser/ui/webui/signin/login_ui_service_factory.h"
@@ -196,6 +197,7 @@ void PeopleHandler::RegisterMessages() {
       "SyncSetupManageOtherPeople",
       base::Bind(&PeopleHandler::HandleManageOtherPeople,
                  base::Unretained(this)));
+
 #if defined(OS_CHROMEOS)
   web_ui()->RegisterMessageCallback(
       "SyncSetupDoSignOutOnAuthError",
@@ -209,6 +211,8 @@ void PeopleHandler::RegisterMessages() {
       "SyncSetupStartSignIn",
       base::Bind(&PeopleHandler::HandleStartSignin, base::Unretained(this)));
 #endif
+
+  web_ui()->AddMessageHandler(new MetricsHandler());
 }
 
 void PeopleHandler::OnJavascriptAllowed() {