Plumb site engagement to the renderer process.

chrome/browser/engagement/site_engagement_score.cc

 // Copyright 2016 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_score.h"
 
 #include <cmath>
 #include <utility>
 
 #include "base/memory/ptr_util.h"
@@ skipping 229 matching lines @@
 void SiteEngagementScore::Commit() {
   DCHECK(settings_map_);
   if (!UpdateScoreDict(score_dict_.get()))
     return;
 
   settings_map_->SetWebsiteSettingDefaultScope(
       origin_, GURL(), CONTENT_SETTINGS_TYPE_SITE_ENGAGEMENT, std::string(),
       std::move(score_dict_));
 }
 
+blink::mojom::EngagementLevel SiteEngagementScore::GetEngagementLevel() const {
+  DCHECK_LT(GetMediumEngagementBoundary(), GetHighEngagementBoundary());
+
+  double score = GetScore();
+  if (score == 0)
+    return blink::mojom::EngagementLevel::NONE;
+
+  if (score < 1)
+    return blink::mojom::EngagementLevel::MINIMAL;
+
+  if (score < GetMediumEngagementBoundary())
+    return blink::mojom::EngagementLevel::LOW;
+
+  if (score < GetHighEngagementBoundary())
+    return blink::mojom::EngagementLevel::MEDIUM;
+
+  if (score < SiteEngagementScore::kMaxPoints)
+    return blink::mojom::EngagementLevel::HIGH;
+
+  return blink::mojom::EngagementLevel::MAX;
+}
+
 bool SiteEngagementScore::MaxPointsPerDayAdded() const {
   if (!last_engagement_time_.is_null() &&
       clock_->Now().LocalMidnight() != last_engagement_time_.LocalMidnight()) {
     return false;
   }
 
   return points_added_today_ == GetMaxPointsPerDay();
 }
 
 void SiteEngagementScore::Reset(double points,
@@ skipping 103 matching lines @@
   GetParamValues()[HIGH_ENGAGEMENT_BOUNDARY].second = 50;
   GetParamValues()[MAX_DECAYS_PER_SCORE].second = 1;
   GetParamValues()[LAST_ENGAGEMENT_GRACE_PERIOD_IN_HOURS].second = 72;
 
   // This is set to values that avoid interference with tests and are set when
   // testing these features.
   GetParamValues()[FIRST_DAILY_ENGAGEMENT].second = 0;
   GetParamValues()[DECAY_PROPORTION].second = 1;
   GetParamValues()[SCORE_CLEANUP_THRESHOLD].second = 0;
 }