Log observations of explicit UPI-VPA autocomplete hints.

components/autofill/core/browser/autofill_metrics.h

 // Copyright 2013 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 COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_METRICS_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_METRICS_H_
 
 #include <stddef.h>
 #include <string>
 
@@ skipping 72 matching lines @@
     NUM_CARD_UPLOAD_DECISION_METRICS,
   };
 
   enum DeveloperEngagementMetric {
     // Parsed a form that is potentially autofillable.
     FILLABLE_FORM_PARSED = 0,
     // Parsed a form that is potentially autofillable and contains at least one
     // web developer-specified field type hint, a la
     // http://is.gd/whatwg_autocomplete
     FILLABLE_FORM_CONTAINS_TYPE_HINTS,
+    // Parsed a form that is potentially autofillable and contains at least one
+    // UPI Virtual Payment Address hint (upi-vpa)
+    FORM_CONTAINS_UPI_VPA_HINT,
     NUM_DEVELOPER_ENGAGEMENT_METRICS,
   };
 
   // The action the user took to dismiss a dialog.
   enum DialogDismissalAction {
     DIALOG_ACCEPTED = 0,  // The user accepted, i.e. submitted, the dialog.
     DIALOG_CANCELED,      // The user canceled out of the dialog.
   };
 
   // The state of the Autofill dialog when it was dismissed.
@@ skipping 657 matching lines @@
     FormFieldData last_polled_field_;
   };
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(AutofillMetrics);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_METRICS_H_