Implement media playing engagement detection for the site engagement service.

chrome/browser/engagement/site_engagement_service.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 "chrome/browser/engagement/site_engagement_service.h"
 
 #include <algorithm>
 #include <cmath>
 #include <vector>
 
@@ skipping 84 matching lines @@
 
   return make_scoped_ptr(static_cast<base::DictionaryValue*>(value.release()));
 }
 
 }  // namespace
 
 const double SiteEngagementScore::kMaxPoints = 100;
 double SiteEngagementScore::g_max_points_per_day = 5;
 double SiteEngagementScore::g_navigation_points = 0.5;
 double SiteEngagementScore::g_user_input_points = 0.05;
+double SiteEngagementScore::g_visible_media_playing_points = 0.02;
+double SiteEngagementScore::g_hidden_media_playing_points = 0.01;
 int SiteEngagementScore::g_decay_period_in_days = 7;
 double SiteEngagementScore::g_decay_points = 5;
 
 const char* SiteEngagementScore::kRawScoreKey = "rawScore";
 const char* SiteEngagementScore::kPointsAddedTodayKey = "pointsAddedToday";
 const char* SiteEngagementScore::kLastEngagementTimeKey = "lastEngagementTime";
 
 void SiteEngagementScore::UpdateFromVariations() {
   std::string max_points_per_day_param = variations::GetVariationParamValue(
       kEngagementParams, kMaxPointsPerDayParam);
@@ skipping 21 matching lines @@
         base::StringToInt(decay_period_in_days_param, &decay_period_in_days) &&
         base::StringToDouble(decay_points_param, &decay_points) &&
         max_points_per_day >= navigation_points &&
         max_points_per_day >= user_input_points && navigation_points >= 0 &&
         user_input_points >= 0 && decay_period_in_days > 0 &&
         decay_points >= 0) {
       g_max_points_per_day = max_points_per_day;
       g_navigation_points = navigation_points;
       g_user_input_points = user_input_points;
       g_decay_period_in_days = decay_period_in_days;
       g_decay_points = decay_points;

[calamity, 2015/11/03 04:49:46]

Need to add controls for the points here (either now or in a follow up).

[dominickn, 2015/11/03 07:03:54]

Done. Don't know how I missed this.

     }
   }
 }
 
 SiteEngagementScore::SiteEngagementScore(
     base::Clock* clock,
     const base::DictionaryValue& score_dict)
     : SiteEngagementScore(clock) {
   score_dict.GetDouble(kRawScoreKey, &raw_score_);
   score_dict.GetDouble(kPointsAddedTodayKey, &points_added_today_);
@@ skipping 154 matching lines @@
 }
 
 void SiteEngagementService::HandleUserInput(
     const GURL& url,
     SiteEngagementMetrics::EngagementType type) {
   SiteEngagementMetrics::RecordEngagement(type);
   AddPoints(url, SiteEngagementScore::g_user_input_points);
   RecordMetrics();
 }
 
+void SiteEngagementService::HandleMediaPlaying(const GURL& url,
+                                               bool is_hidden) {
+  SiteEngagementMetrics::RecordEngagement(
+      is_hidden ? SiteEngagementMetrics::ENGAGEMENT_MEDIA_HIDDEN
+                : SiteEngagementMetrics::ENGAGEMENT_MEDIA_VISIBLE);
+  AddPoints(url, is_hidden
+                     ? SiteEngagementScore::g_hidden_media_playing_points
+                     : SiteEngagementScore::g_visible_media_playing_points);
+  RecordMetrics();
+}
+
 double SiteEngagementService::GetScore(const GURL& url) {
   HostContentSettingsMap* settings_map =
     HostContentSettingsMapFactory::GetForProfile(profile_);
   scoped_ptr<base::DictionaryValue> score_dict =
       GetScoreDictForOrigin(settings_map, url);
   SiteEngagementScore score(clock_.get(), *score_dict);
 
   return score.Score();
 }
 
@@ skipping 160 matching lines @@
 int SiteEngagementService::OriginsWithMaxEngagement(
     std::map<GURL, double>& score_map) {
   int total_origins = 0;
 
   for (const auto& value : score_map)
     if (value.second == SiteEngagementScore::kMaxPoints)
       ++total_origins;
 
   return total_origins;
 }