Add a comment for the class TabSpecificContentSettings

chrome/browser/content_settings/tab_specific_content_settings.h

 // Copyright (c) 2012 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_CONTENT_SETTINGS_TAB_SPECIFIC_CONTENT_SETTINGS_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_TAB_SPECIFIC_CONTENT_SETTINGS_H_
 
 #include <set>
 #include <string>
 
@@ skipping 16 matching lines @@
 class Profile;
 
 namespace content {
 class RenderViewHost;
 }
 
 namespace net {
 class CookieOptions;
 }
 
+// This class manages state about permissions, content settings, cookies and
+// site data for a specific WebContents. It tracks which content was accessed
+// and which content was blocked. Based on this it provides information about
+// which types of content were accessed and blocked.
 class TabSpecificContentSettings
     : public content::WebContentsObserver,
       public content::NotificationObserver,
       public content::WebContentsUserData<TabSpecificContentSettings> {
  public:
   // Classes that want to be notified about site data events must implement
   // this abstract class and add themselves as observer to the
   // |TabSpecificContentSettings|.
   class SiteDataObserver {
    public:
@@ skipping 294 matching lines @@
 
   // Stores whether the user can load blocked plugins on this page.
   bool load_plugins_link_enabled_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(TabSpecificContentSettings);
 };
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_TAB_SPECIFIC_CONTENT_SETTINGS_H_