Adjust displayed phone number for prefix/suffix case.

components/autofill/core/browser/autofill_field.h

Index: components/autofill/core/browser/autofill_field.h
diff --git a/components/autofill/core/browser/autofill_field.h b/components/autofill/core/browser/autofill_field.h
index b810e76010cef8ce961ae903adce385e093dc2d3..96f07f923b30110a037886af6a4aeead8bf92196 100644
--- a/components/autofill/core/browser/autofill_field.h
+++ b/components/autofill/core/browser/autofill_field.h
@@ -75,6 +75,13 @@ class AutofillField : public FormFieldData {
                             const std::string& app_locale,
                             FormFieldData* field_data);
 
+  // Returns the phone number value for the given |field|. The returned value
+  // might be |number|, or could possibly be a prefix or suffix of |number|
+  // if that's appropriate for the field.
+  static base::string16 GetPhoneNumberValue(const AutofillField& field,
+                                            const base::string16& number,
+                                            const FormFieldData& field_data);
+
  private:
   // The unique name of this field, generated by Autofill.
   base::string16 unique_name_;