Add a way to query a cookie store whether any cookies exist for a given

net/cookies/cookie_monster.h

Index: net/cookies/cookie_monster.h
===================================================================
--- net/cookies/cookie_monster.h	(revision 194665)
+++ net/cookies/cookie_monster.h	(working copy)
@@ -124,6 +124,7 @@
 
   typedef base::Callback<void(const CookieList& cookies)> GetCookieListCallback;
   typedef base::Callback<void(bool success)> DeleteCookieCallback;
+  typedef base::Callback<void(bool cookies_exist)> HasCookiesForETLDP1Callback;
 
   // Sets a cookie given explicit user-provided cookie attributes. The cookie
   // name, value, domain, etc. are each provided as separate strings. This
@@ -176,6 +177,10 @@
   void DeleteCanonicalCookieAsync(const CanonicalCookie& cookie,
                                   const DeleteCookieCallback& callback);
 
+  // Checks whether for a given ETLD+1, there currently exist any cookies.
+  void HasCookiesForETLDP1Async(const std::string& etldp1,
+                                const HasCookiesForETLDP1Callback& callback);
+
   // Resets the list of cookieable schemes to the supplied schemes.
   // If this this method is called, it must be called before first use of
   // the instance (i.e. as part of the instance initialization process).
@@ -276,6 +281,7 @@
   class SetCookieWithDetailsTask;
   class SetCookieWithOptionsTask;
   class DeleteSessionCookiesTask;
+  class HasCookiesForETLDP1Task;
 
   // Testing support.
   // For SetCookieWithCreationTime.
@@ -404,6 +410,8 @@
 
   int DeleteSessionCookies();
 
+  bool HasCookiesForETLDP1(const std::string& etldp1);
+
   // Called by all non-static functions to ensure that the cookies store has
   // been initialized. This is not done during creating so it doesn't block
   // the window showing.