Plumb site engagement to the renderer process.

chrome/browser/engagement/site_engagement_score.cc

Index: chrome/browser/engagement/site_engagement_score.cc
diff --git a/chrome/browser/engagement/site_engagement_score.cc b/chrome/browser/engagement/site_engagement_score.cc
index d38d2ad9f349ddfa7d0d7f635d88c7627895ea42..d9cae365b7f3a54a93f55aeec95321fef01a458d 100644
--- a/chrome/browser/engagement/site_engagement_score.cc
+++ b/chrome/browser/engagement/site_engagement_score.cc
@@ -247,6 +247,28 @@ void SiteEngagementScore::Commit() {
       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()) {