Update user input event's engagement value.

chrome/browser/engagement/site_engagement_service.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_SERVICE_H_
 #define CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_SERVICE_H_
 
 #include <map>
 #include <set>
 
@@ skipping 113 matching lines @@
   static const char* kLastShortcutLaunchTimeKey;
 
   // This version of the constructor is used in unit tests.
   explicit SiteEngagementScore(base::Clock* clock);
 
   // Determine the score, accounting for any decay.
   double DecayedScore() const;
 
   // Determine any score bonus from having installed shortcuts.
   double BonusScore() const;
 

[dominickn, 2016/01/25 03:04:57]

Nit: add a comment along the lines of "Sets fixed parameter values for testing
site engagement. Ensure that any new parameters receive a fixed value here."
Just to ensure that future changes to site engagement don't miss this testing
wrinkle.

[calamity, 2016/01/27 03:47:23]

Done.

-  static void DisableFirstDailyEngagementBonusForTesting();
+  static void SetParamValuesForTesting();
 
   // The clock used to vend times. Enables time travelling in tests. Owned by
   // the SiteEngagementService.
   base::Clock* clock_;
 
   // |raw_score_| is the score before any decay is applied.
   double raw_score_;
 
   // The points added 'today' are tracked to avoid adding more than
   // kMaxPointsPerDay on any one day. 'Today' is defined in local time.
@@ skipping 127 matching lines @@
   // origin's engagement score after an hour has elapsed triggers the next
   // upload.
   base::Time last_metrics_time_;
 
   base::WeakPtrFactory<SiteEngagementService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SiteEngagementService);
 };
 
 #endif  // CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_SERVICE_H_