[Autofill] Fill fields where the value equals the placeholder attribute.

components/autofill/content/common/autofill_messages.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.
 
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 #include <vector>
 
 #include "base/strings/string16.h"
@@ skipping 27 matching lines @@
 
 IPC_ENUM_TRAITS_MAX_VALUE(base::i18n::TextDirection,
                           base::i18n::TEXT_DIRECTION_NUM_DIRECTIONS - 1)
 
 IPC_STRUCT_TRAITS_BEGIN(autofill::FormFieldData)
   IPC_STRUCT_TRAITS_MEMBER(label)
   IPC_STRUCT_TRAITS_MEMBER(name)
   IPC_STRUCT_TRAITS_MEMBER(value)
   IPC_STRUCT_TRAITS_MEMBER(form_control_type)
   IPC_STRUCT_TRAITS_MEMBER(autocomplete_attribute)
+  IPC_STRUCT_TRAITS_MEMBER(placeholder)
   IPC_STRUCT_TRAITS_MEMBER(role)
   IPC_STRUCT_TRAITS_MEMBER(max_length)
   IPC_STRUCT_TRAITS_MEMBER(is_autofilled)
   IPC_STRUCT_TRAITS_MEMBER(is_checked)
   IPC_STRUCT_TRAITS_MEMBER(is_checkable)
   IPC_STRUCT_TRAITS_MEMBER(is_focusable)
   IPC_STRUCT_TRAITS_MEMBER(should_autocomplete)
   IPC_STRUCT_TRAITS_MEMBER(text_direction)
   IPC_STRUCT_TRAITS_MEMBER(option_values)
   IPC_STRUCT_TRAITS_MEMBER(option_contents)
@@ skipping 299 matching lines @@
 // Inform browser of data list values for the curent field.
 IPC_MESSAGE_ROUTED2(AutofillHostMsg_SetDataList,
                     std::vector<base::string16> /* values */,
                     std::vector<base::string16> /* labels */)
 
 // Inform the browser which password form is currently focused, as a response
 // to the |AutofillMsg_FindFocusedPasswordForm| request. If no password form
 // is focused, the response will contain an empty |autofill::PasswordForm|.
 IPC_MESSAGE_ROUTED1(AutofillHostMsg_FocusedPasswordFormFound,
                     autofill::PasswordForm)