Add UMA metrics to the site engagement service.

chrome/browser/engagement/site_engagement_helper.h

 // 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.
 
 #ifndef CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_HELPER_H_
 #define CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_HELPER_H_
 
 #include "base/macros.h"
 #include "base/timer/timer.h"
+#include "chrome/browser/engagement/site_engagement_metrics.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
 namespace content {
 class WebContents;
 }
 
 class GURL;
 
@@ skipping 56 matching lines @@
     bool callbacks_added_;
   };
 
   explicit SiteEngagementHelper(content::WebContents* web_contents);
   friend class content::WebContentsUserData<SiteEngagementHelper>;
   friend class SiteEngagementServiceBrowserTest;
   friend class TestSiteEngagementHelper;
 
   // Ask the SiteEngagementService to record engagement via user input at the
   // current contents location.
-  virtual void RecordUserInput();
+  virtual void RecordUserInput(SiteEngagementMetrics::EngagementType type);
 
   virtual bool ShouldRecordEngagement();
 
   // content::WebContentsObserver overrides.
   void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) override;
 
   void RenderViewHostChanged(content::RenderViewHost* old_host,
                              content::RenderViewHost* new_host) override;
 
   void WasShown() override;
   void WasHidden() override;
 
   InputTracker input_tracker_;
   bool record_engagement_;
 
   DISALLOW_COPY_AND_ASSIGN(SiteEngagementHelper);
 };
 
 #endif  // CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_HELPER_H_