Clear app banner data when history is cleared.

chrome/browser/banners/app_banner_settings_helper.h

 // Copyright 2014 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_BANNERS_APP_BANNER_SETTINGS_HELPER_H_
 #define CHROME_BROWSER_BANNERS_APP_BANNER_SETTINGS_HELPER_H_
 
+#include <set>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/time/time.h"
 
 namespace content {
 class WebContents;
 }  // namespace content
 
 class GURL;
+class Profile;
 
 // Utility class to record banner events for the given package or start url.
 //
 // These events are used to decide when banners should be shown, using a
 // heuristic based on how many different days in a recent period of time (for
 // example the past two weeks) the banner could have been shown, when it was
 // last shown, when it was last blocked, and when it was last installed (for
 // ServiceWorker style apps - native apps can query whether the app was
 // installed directly).
 //
 // The desired effect is to have banners appear once a user has demonstrated
 // an ongoing relationship with the app, and not to pester the user too much.
 //
 // For most events only the last event is recorded. The exception are the
 // could show events. For these a list of the events is maintained. At most
 // one event is stored per day, and events outside the window the heuristic
 // uses are discarded. Local times are used to enforce these rules, to ensure
 // what we count as a day matches what the user perceives to be days.
 class AppBannerSettingsHelper {
  public:
   enum AppBannerEvent {
     APP_BANNER_EVENT_COULD_SHOW,
     APP_BANNER_EVENT_DID_SHOW,
     APP_BANNER_EVENT_DID_BLOCK,
     APP_BANNER_EVENT_DID_ADD_TO_HOMESCREEN,
     APP_BANNER_EVENT_NUM_EVENTS,
   };
 
+  // The content setting basically records a simplified subset of history.
+  // For privacy reasons this needs to be cleared. The ClearHistoryForURLs
+  // function removes any information from the banner content settings for the
+  // given URls.
+  static void ClearHistoryForURLs(Profile* profile,
+                                  const std::set<GURL>& origin_urls);
+
   static void RecordBannerEvent(content::WebContents* web_contents,
                                 const GURL& origin_url,
                                 const std::string& package_name_or_start_url,
                                 AppBannerEvent event,
                                 base::Time time);
 
   // Determine if the banner should be shown, given the recorded events for the
   // supplied app.
   static bool ShouldShowBanner(content::WebContents* web_contents,
                                const GURL& origin_url,
@@ skipping 25 matching lines @@
   // Blocks a URL from showing a banner for the given package or start url.
   static void Block(content::WebContents* web_contents,
                     const GURL& origin_url,
                     const std::string& package_name_or_start_url);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(AppBannerSettingsHelper);
 };
 
 #endif  // CHROME_BROWSER_BANNERS_APP_BANNER_SETTINGS_HELPER_H_