Add metrics to track Autofill "user happiness"

chrome/browser/autofill/form_structure.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_BROWSER_AUTOFILL_FORM_STRUCTURE_H_
 #define CHROME_BROWSER_AUTOFILL_FORM_STRUCTURE_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 91 matching lines @@
   bool ShouldBeCrowdsourced() const;
 
   // Sets the field types and experiment id to be those set for |cached_form|.
   void UpdateFromCache(const FormStructure& cached_form);
 
   // Logs quality metrics for |this|, which should be a user-submitted form.
   // This method should only be called after the possible field types have been
   // set for each field.
   void LogQualityMetrics(const AutofillMetrics& metric_logger) const;
 
-  // Sets the possible types for the field at |index|.
-  void set_possible_types(size_t index, const FieldTypeSet& types);
-
   const AutofillField* field(size_t index) const;
+  AutofillField* field(size_t index);
   size_t field_count() const;
 
   // Returns the number of fields that are able to be autofilled.
   size_t autofill_count() const { return autofill_count_; }
 
   // Used for iterating over the fields.
   std::vector<AutofillField*>::const_iterator begin() const {
     return fields_.begin();
   }
   std::vector<AutofillField*>::const_iterator end() const {
@@ skipping 75 matching lines @@
   RequestMethod method_;
 
   // Whether the form includes any field types explicitly specified by the site
   // author, via the |autocompletetype| attribute.
   bool has_author_specified_types_;
 
   DISALLOW_COPY_AND_ASSIGN(FormStructure);
 };
 
 #endif  // CHROME_BROWSER_AUTOFILL_FORM_STRUCTURE_H_