Add a comment for the class TabSpecificContentSettings

chrome/browser/content_settings/tab_specific_content_settings.h

Index: chrome/browser/content_settings/tab_specific_content_settings.h
diff --git a/chrome/browser/content_settings/tab_specific_content_settings.h b/chrome/browser/content_settings/tab_specific_content_settings.h
index 6ad0692caf7e4cdd3ad9b65225418c7ad20a55e0..1ab21f8428cce554420101b4fd45dfbff4461d67 100644
--- a/chrome/browser/content_settings/tab_specific_content_settings.h
+++ b/chrome/browser/content_settings/tab_specific_content_settings.h
@@ -34,6 +34,10 @@ 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,