[Smart Lock] Measure clicks on the lock icon during Easy Unlock's trial run.

chrome/browser/ui/webui/chromeos/login/user_board_screen_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/user_board_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/user_board_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/user_board_screen_handler.cc
index e810a2c5d44c5b3b995b946bc90203dc7d4e6cc2..80f8bb7645113b23c5eb8bd61fd0dc393a9b4ad2 100644
--- a/chrome/browser/ui/webui/chromeos/login/user_board_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/user_board_screen_handler.cc
@@ -23,6 +23,8 @@ void UserBoardScreenHandler::RegisterMessages() {
   AddCallback("getUsers", &UserBoardScreenHandler::HandleGetUsers);
   AddCallback("attemptUnlock", &UserBoardScreenHandler::HandleAttemptUnlock);
   AddCallback("hardlockPod", &UserBoardScreenHandler::HandleHardlockPod);
+  AddCallback("recordClickOnLockIcon",
+              &UserBoardScreenHandler::HandleRecordClickOnLockIcon);
 }
 
 void UserBoardScreenHandler::Initialize() {
@@ -45,6 +47,12 @@ void UserBoardScreenHandler::HandleAttemptUnlock(const std::string& user_id) {
   model_->AttemptEasyUnlock(user_id);
 }
 
+void UserBoardScreenHandler::HandleRecordClickOnLockIcon(
+    const std::string& user_id) {
+  CHECK(model_);
+  model_->RecordClickOnLockIcon(user_id);
+}
+
 //----------------- API
 
 void UserBoardScreenHandler::SetPublicSessionDisplayName(