Add autofill preview support for <month> input fields

chrome/renderer/autofill/form_autofill_browsertest.cc

 // Copyright (c) 2012 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.
 
 #include <vector>
 
 #include "base/format_macros.h"
 #include "base/metrics/field_trial.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
@@ skipping 1183 matching lines @@
       // Disabled fields should not be previewed.
       {"text", "notenabled", "", "", false, "suggested notenabled", ""},
       // Readonly fields should not be previewed.
       {"text", "readonly", "", "", false, "suggested readonly", ""},
       // Fields with "visibility: hidden" should not be previewed.
       {"text", "invisible", "", "", false, "suggested invisible",
        ""},
       // Fields with "display:none" should not previewed.
       {"text", "displaynone", "", "", false, "suggested displaynone",
        ""},
-      // Regular <input type="month"> should not be previewed.
-      {"month", "month", "", "", false, "2017-11", ""},
+      // Regular <input type="month"> should be previewed.
+      {"month", "month", "", "", true, "2017-11", "2017-11"},
       // Non-empty <input type="month"> should not be previewed.
       {"month", "month-nonempty", "2011-12", "", false, "2017-11", ""},
       // Regular select fields preview is not yet supported
       {"select-one", "select", "", "", false, "TX", ""},
       // Select fields preview is not yet supported
       {"select-one", "select-nonempty", "CA", "", false, "TX", "CA"},
       // Normal textarea elements should be previewed.
       {"textarea", "textarea", "", "", true, "suggested multi-\nline value",
        "suggested multi-\nline value"},
       // Nonempty textarea elements should not be previewed.
@@ skipping 1998 matching lines @@
   EXPECT_FORM_FIELD_DATA_EQUALS(expected, fields[1]);
 
   expected.name = ASCIIToUTF16("country");
   expected.value = ASCIIToUTF16("AL");
   expected.form_control_type = "select-one";
   expected.max_length = 0;
   EXPECT_FORM_FIELD_DATA_EQUALS(expected, fields[2]);
 }
 
 }  // namespace autofill