Add metrics to track Autofill "user happiness"

chrome/browser/autofill/autofill_metrics.h

Index: chrome/browser/autofill/autofill_metrics.h
diff --git a/chrome/browser/autofill/autofill_metrics.h b/chrome/browser/autofill/autofill_metrics.h
index 22bd74b9d38a068df69e5da41f6768113563b658..6e316e1a1f98ca3ac9847d71c5c922290ec21278 100644
--- a/chrome/browser/autofill/autofill_metrics.h
+++ b/chrome/browser/autofill/autofill_metrics.h
@@ -79,6 +79,47 @@ class AutofillMetrics {
     NUM_SERVER_QUERY_METRICS
   };
 
+  // Each of these metrics is logged only for potentially autofillable forms,
+  // i.e. forms with at least three fields, etc.
+  // These are used to derive certain "user happiness" metrics.  For example, we
+  // can compute the ratio (USER_DID_EDIT_AUTOFILLED_FIELD / USER_DID_AUTOFILL)
+  // to see how often users have to correct autofilled data.
+  enum UserHappinessMetric {
+    // Loaded a page containing forms.
+    FORMS_LOADED,
+    // Submitted a fillable form -- i.e. one with at least three field values
+    // that match the user's stored Autofill data -- and all matching fields
+    // were autofilled.
+    SUBMITTED_FILLABLE_FORM_AUTOFILLED_ALL,
+    // Submitted a fillable form and some (but not all) matching fields were
+    // autofilled.
+    SUBMITTED_FILLABLE_FORM_AUTOFILLED_SOME,
+    // Submitted a fillable form and no fields were autofilled.
+    SUBMITTED_FILLABLE_FORM_AUTOFILLED_NONE,
+    // Submitted a non-fillable form.
+    SUBMITTED_NON_FILLABLE_FORM,
+
+    // User manually filled one of the form fields.
+    USER_DID_TYPE,
+    // We showed a popup containing Autofill suggestions.
+    SUGGESTIONS_SHOWN,
+    // Same as above, but only logged once per page load.
+    SUGGESTIONS_SHOWN_ONCE,
+    // User autofilled at least part of the form.
+    USER_DID_AUTOFILL,
+    // Same as above, but only logged once per page load.
+    USER_DID_AUTOFILL_ONCE,
+    // User edited a previously autofilled field.
+    USER_DID_EDIT_AUTOFILLED_FIELD,
+    // Same as above, but only logged once per page load.
+    USER_DID_EDIT_AUTOFILLED_FIELD_ONCE,
+    NUM_USER_HAPPINESS_METRICS
+  };
+
+  // TODO(isherman): Add histograms to measure time elapsed between form load
+  // form submission, comparing autofilled and non-autofilled forms.  So that we
+  // are measuring apples to apples, restrict just to fillable forms.
+
   AutofillMetrics();
   virtual ~AutofillMetrics();
 
@@ -101,6 +142,8 @@ class AutofillMetrics {
 
   virtual void LogServerQueryMetric(ServerQueryMetric metric) const;
 
+  virtual void LogUserHappinessMetric(UserHappinessMetric metric) const;
+
 
   // This should be called each time a page containing forms is loaded.
   virtual void LogIsAutofillEnabledAtPageLoad(bool enabled) const;