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

chrome/browser/subresource_filter/subresource_filter_profile_context.cc

 // Copyright 2017 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/subresource_filter/subresource_filter_profile_context.h"
 
 #include "base/memory/ptr_util.h"
+#include "chrome/browser/subresource_filter/subresource_filter_activation_tracker.h"
 #include "chrome/browser/subresource_filter/subresource_filter_content_settings_manager.h"
 
 SubresourceFilterProfileContext::SubresourceFilterProfileContext(
     Profile* profile)
     : content_settings_manager_(
-          base::MakeUnique<SubresourceFilterContentSettingsManager>(profile)) {}
+          base::MakeUnique<SubresourceFilterContentSettingsManager>(profile)),
+      activation_tracker_(
+          base::MakeUnique<SubresourceFilterActivationTracker>()) {}
 
 SubresourceFilterProfileContext::~SubresourceFilterProfileContext() {}
 
 void SubresourceFilterProfileContext::Shutdown() {
   content_settings_manager_.reset();
 }