Implement a site engagement score based on time-on-site.

chrome/browser/engagement/site_engagement_eviction_policy_unittest.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_eviction_policy.h"
 #include "chrome/browser/engagement/site_engagement_service.h"
 #include "content/public/test/mock_special_storage_policy.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 const int64 kGlobalQuota = 25 * 1024;
 
 }  // namespace
 
 class TestSiteEngagementScoreProvider : public SiteEngagementScoreProvider {
  public:
   TestSiteEngagementScoreProvider() {}
 
   virtual ~TestSiteEngagementScoreProvider() {}
 
-  int GetScore(const GURL& url) override { return engagement_score_map_[url]; }
+  double GetScore(const GURL& url) override {
+    return engagement_score_map_[url];
+  }
 
-  int GetTotalEngagementPoints() override {
-    int total = 0;
+  double GetTotalEngagementPoints() override {
+    double total = 0;
     for (const auto& site : engagement_score_map_)
       total += site.second;
     return total;
   }
 
-  void SetScore(const GURL& origin, int score) {
+  void SetScore(const GURL& origin, double score) {
     engagement_score_map_[origin] = score;
   }
 
  private:
-  std::map<GURL, int> engagement_score_map_;
+  std::map<GURL, double> engagement_score_map_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSiteEngagementScoreProvider);
 };
 
 class SiteEngagementEvictionPolicyTest : public testing::Test {
  public:
   SiteEngagementEvictionPolicyTest()
       : score_provider_(new TestSiteEngagementScoreProvider()),
         storage_policy_(new content::MockSpecialStoragePolicy()) {}
 
@@ skipping 72 matching lines @@
   EXPECT_EQ(url2, CalculateEvictionOrigin(usage));
 
   // Durable storage doesn't get evicted.
   storage_policy()->AddDurable(url2);
   EXPECT_EQ(url1, CalculateEvictionOrigin(usage));
 
   // Unlimited storage doesn't get evicted.
   storage_policy()->AddUnlimited(url1);
   EXPECT_EQ(GURL(), CalculateEvictionOrigin(usage));
 }