[subresource_filter] Implement the "Smart" UI on Android

chrome/browser/subresource_filter/subresource_filter_content_settings_manager.h

 // 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.
 
 #ifndef CHROME_BROWSER_SUBRESOURCE_FILTER_SUBRESOURCE_FILTER_CONTENT_SETTINGS_MANAGER_H_
 #define CHROME_BROWSER_SUBRESOURCE_FILTER_SUBRESOURCE_FILTER_CONTENT_SETTINGS_MANAGER_H_
 
+#include <memory>
+#include <set>
 #include <string>
+#include <utility>
 
 #include "base/macros.h"
+#include "base/scoped_observer.h"
+#include "base/time/clock.h"
+#include "base/time/time.h"
 #include "components/content_settings/core/browser/content_settings_observer.h"
+#include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_types.h"
+#include "components/history/core/browser/history_service_observer.h"
 
 class ContentSettingsPattern;
+class GURL;
 class HostContentSettingsMap;
 class Profile;
 
-// This class observes subresource filter content settings changes for metrics
-// collection.
+namespace base {
+class DictionaryValue;
+}  // namespace base
+
+namespace history {
+class HistoryService;
+}  // namespace history
+
+// This class contains helpers to get/set content and website settings related
+// to subresource filtering. It also observes content setting changes for
+// metrics collection.
 class SubresourceFilterContentSettingsManager
-    : public content_settings::Observer {
+    : public content_settings::Observer,
+      public history::HistoryServiceObserver {
  public:
   explicit SubresourceFilterContentSettingsManager(Profile* profile);
   ~SubresourceFilterContentSettingsManager() override;
 
+  ContentSetting GetSitePermission(const GURL& url) const;
+
+  // Only called via direct user action on via the subresource filter UI. Sets
+  // the content setting to turn off the subresource filter.
+  void WhitelistSite(const GURL& url);
+
+  // Specific logic for more intelligent UI.
+  void OnDidShowUI(const GURL& url);
+  bool ShouldShowUIForSite(const GURL& url) const;
+  bool should_use_smart_ui() const { return should_use_smart_ui_; }
+
+  void set_clock_for_testing(std::unique_ptr<base::Clock> tick_clock) {
+    clock_ = std::move(tick_clock);
+  }
+
+  // Time before showing the UI again on a domain.
+  // TODO(csharrison): Consider setting this via a finch param.
+  static constexpr base::TimeDelta kDelayBeforeShowingInfobarAgain =
+      base::TimeDelta::FromMinutes(30);
+
  private:
   // content_settings::Observer:
   void OnContentSettingChanged(const ContentSettingsPattern& primary_pattern,
                                const ContentSettingsPattern& secondary_pattern,
                                ContentSettingsType content_type,
                                std::string resource_identifier) override;
 
+  // history::HistoryServiceObserver:
+  void OnURLsDeleted(history::HistoryService* history_service,
+                     bool all_history,
+                     bool expired,
+                     const history::URLRows& deleted_rows,
+                     const std::set<GURL>& favicon_urls) override;
+
+  std::unique_ptr<base::DictionaryValue> GetSiteMetadata(const GURL& url) const;
+  void SetSiteMetadata(const GURL& url,
+                       std::unique_ptr<base::DictionaryValue> dict);
+
+  ScopedObserver<history::HistoryService, history::HistoryServiceObserver>
+      history_observer_;
+
   HostContentSettingsMap* settings_map_;
 
+  // A clock is injected into this class so tests can set arbitrary timestamps
+  // in website settings.
+  std::unique_ptr<base::Clock> clock_;
+
+  // Used internally so the class ignores changes to the settings that are not
+  // user initiated through the settings UI.
+  bool ignore_settings_changes_ = false;
+
+  const bool should_use_smart_ui_ = false;
+
   DISALLOW_COPY_AND_ASSIGN(SubresourceFilterContentSettingsManager);
 };
 
 #endif  // CHROME_BROWSER_SUBRESOURCE_FILTER_SUBRESOURCE_FILTER_CONTENT_SETTINGS_MANAGER_H_