Add UMA metrics to the site engagement service.

chrome/browser/engagement/site_engagement_service_browsertest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/command_line.h"
 #include "base/observer_list.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/task_runner.h"
 #include "base/test/simple_test_clock.h"
@@ skipping 48 matching lines @@
   }
 
   void EnableCallbackRegistration() {
     enable_callbacks_ = true;
   }
 
   void DisableCallbackRegistration() {
     enable_callbacks_ = false;
   }
 
-  void RecordUserInput() override {
-    SiteEngagementHelper::RecordUserInput();
+  void RecordUserInput(SiteEngagementMetrics::EngagementType type) override {
+    SiteEngagementHelper::RecordUserInput(type);
     FOR_EACH_OBSERVER(Observer, observer_list_, OnInputRecorded(this));
   }
 
  private:
   friend class SiteEngagementServiceBrowserTest;
   base::ObserverList<Observer> observer_list_;
   bool enable_callbacks_;
 
 };
 
@@ skipping 435 matching lines @@
 
     // Timer runs after input is recorded, and after it fires the callbacks are
     // added.
     EXPECT_FALSE(CallbacksAdded(helper.get()));
     EXPECT_TRUE(timer->IsRunning());
     timer->Fire();
     EXPECT_FALSE(timer->IsRunning());
     EXPECT_TRUE(CallbacksAdded(helper.get()));
   }
 }