Add metrics to measure time elapsed between form load and form submission with or without Autofill.

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 12 matching lines @@
 };
 
 enum UploadRequired {
   UPLOAD_NOT_REQUIRED,
   UPLOAD_REQUIRED,
   USE_UPLOAD_RATES
 };
 
 class AutofillMetrics;
 
+namespace base {
+class TimeTicks;
+}
+
 namespace buzz {
 class XmlElement;
 }
 
 namespace webkit_glue {
 struct FormData;
 struct FormDataPredictions;
 }
 
 // FormStructure stores a single HTML form together with the values entered
@@ skipping 56 matching lines @@
   // Returns true if we should query the crowdsourcing server to determine this
   // form's field types.  If the form includes author-specified types, this will
   // return false.
   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;
+  // set for each field.  |interaction_time| should be a timestamp corresponding
+  // to the user's first interaction with the form.  |submission_time| should be
+  // a timestamp corresponding to the form's submission.
+  void LogQualityMetrics(const AutofillMetrics& metric_logger,
+                         const base::TimeTicks& load_time,
+                         const base::TimeTicks& interaction_time,
+                         const base::TimeTicks& submission_time) const;
 
   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 {
@@ skipping 78 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_