[Cronet] Add CookieStoreIOS.

components/cronet/ios/test/test_server.h

Index: components/cronet/ios/test/test_server.h
diff --git a/components/cronet/ios/test/test_server.h b/components/cronet/ios/test/test_server.h
index 7e908702f776a5f90da41c851256d6c723360749..4804f24cbf5b5586f70a9d6e304c8d230d78a633 100644
--- a/components/cronet/ios/test/test_server.h
+++ b/components/cronet/ios/test/test_server.h
@@ -14,7 +14,12 @@ class TestServer {
   static bool Start();
   static void Shutdown();
 
+  // Returns URL which respond with echo of header with |header_name| in
+  // response body.
   static std::string GetEchoHeaderURL(const std::string& header_name);
+  // Returns URL which respond with setting cookie to |cookie_line| and echo it
+  // in response body.
+  static std::string GetSetCookieURL(const std::string& cookie_line);
 };
 
 }  // namespace cronet