Add metrics to track Autofill "user happiness"

chrome/renderer/autofill/autofill_agent.h

 // Copyright (c) 2011 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_RENDERER_AUTOFILL_AUTOFILL_AGENT_H_
 #define CHROME_RENDERER_AUTOFILL_AUTOFILL_AGENT_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 145 matching lines @@
 
   // Was the query node autofilled prior to previewing the form?
   bool was_query_node_autofilled_;
 
   // The menu index of the "Clear" menu item.
   int suggestions_clear_index_;
 
   // The menu index of the "Autofill options..." menu item.
   int suggestions_options_index_;
 
+  // Have we already shown Autofill suggestions for the field the user is
+  // currently editing?  Used to keep track of state for metrics logging.
+  bool has_shown_autofill_popup_for_current_edit_;
+
   ScopedRunnableMethodFactory<AutofillAgent> method_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AutofillAgent);
 };
 
 }  // namespace autofill
 
 #endif  // CHROME_RENDERER_AUTOFILL_AUTOFILL_AGENT_H_