Add "previewing on hover" support for single-field autocomplete input

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 "base/time/time.h"
 #include "components/autofill/content/common/autofill_param_traits_macros.h"
@@ skipping 104 matching lines @@
     AutofillMsg_FieldTypePredictionsAvailable,
     std::vector<autofill::FormDataPredictions> /* forms */)
 
 // Clears the currently displayed Autofill results.
 IPC_MESSAGE_ROUTED0(AutofillMsg_ClearForm)
 
 // Tells the renderer that the Autofill previewed form should be cleared.
 IPC_MESSAGE_ROUTED0(AutofillMsg_ClearPreviewedForm)
 
 // Sets the currently selected node's value.
-IPC_MESSAGE_ROUTED1(AutofillMsg_SetNodeText,
-                    base::string16 /* new node text */)
+IPC_MESSAGE_ROUTED1(AutofillMsg_FillFieldWithValue,
+                    base::string16 /* value */)
+
+// Sets the suggested value for the currently previewed node.
+IPC_MESSAGE_ROUTED1(AutofillMsg_PreviewFieldWithValue,
+                    base::string16 /* value */)
 
 // Sets the currently selected node's value to be the given data list value.
 IPC_MESSAGE_ROUTED1(AutofillMsg_AcceptDataListSuggestion,
                     base::string16 /* accepted data list value */)
 
 // Tells the renderer to populate the correct password fields with this
 // generated password.
 IPC_MESSAGE_ROUTED1(AutofillMsg_GeneratedPasswordAccepted,
                     base::string16 /* generated_password */)
 
@@ skipping 109 matching lines @@
 IPC_MESSAGE_ROUTED4(AutofillHostMsg_ShowPasswordSuggestions,
                     autofill::FormFieldData /* the form field */,
                     gfx::RectF /* input field bounds, window-relative */,
                     std::vector<base::string16> /* suggestions */,
                     std::vector<base::string16> /* realms */)
 
 // 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 */)