[on-hold][subresource_filter] Add ActivationTracker to track all activated contents

components/subresource_filter/content/browser/content_subresource_filter_driver_factory_unittest.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 "components/subresource_filter/content/browser/content_subresource_filter_driver_factory.h"
 
 #include <set>
 #include <string>
 
 #include "base/macros.h"
@@ skipping 191 matching lines @@
   void WhitelistByContentSettings(const GURL& url) override {}
   void WhitelistInCurrentWebContents(const GURL& url) override {
     if (url.SchemeIsHTTPOrHTTPS())
       whitelisted_hosts_.insert(url.host());
   }
 
   VerifiedRulesetDealer::Handle* GetRulesetDealer() override {
     return ruleset_dealer_;
   }
 
+  void OnPageActivated(const ActivationState& state) override {}
+
   MOCK_METHOD1(ToggleNotificationVisibility, void(bool));
 
  private:
   std::set<std::string> whitelisted_hosts_;
   // Owned by the test harness.
   VerifiedRulesetDealer::Handle* ruleset_dealer_;
 
   DISALLOW_COPY_AND_ASSIGN(MockSubresourceFilterClient);
 };
 
@@ skipping 663 matching lines @@
     ActivationScopeTest,
     ContentSubresourceFilterDriverFactoryActivationScopeTest,
     ::testing::ValuesIn(kActivationScopeTestData));
 
 INSTANTIATE_TEST_CASE_P(
     ActivationLevelTest,
     ContentSubresourceFilterDriverFactoryActivationLevelTest,
     ::testing::ValuesIn(kActivationLevelTestData));
 
 }  // namespace subresource_filter