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

components/autofill/core/browser/autofill_external_delegate.cc

Index: components/autofill/core/browser/autofill_external_delegate.cc
diff --git a/components/autofill/core/browser/autofill_external_delegate.cc b/components/autofill/core/browser/autofill_external_delegate.cc
index c4367567ff274c7801e20dea6ef5f0dd89111e21..6dde33d468d9b13016a95e0bec3fb867ecadd6b0 100644
--- a/components/autofill/core/browser/autofill_external_delegate.cc
+++ b/components/autofill/core/browser/autofill_external_delegate.cc
@@ -164,12 +164,18 @@ bool AutofillExternalDelegate::ShouldRepostEvent(const ui::MouseEvent& event) {
   return true;
 }
 
-void AutofillExternalDelegate::DidSelectSuggestion(int identifier) {
+void AutofillExternalDelegate::DidSelectSuggestion(int identifier,
+                                                   const base::string16& value)
+{

[Ilya Sherman, 2014/02/22 05:59:51]

nit: The curly brace should be on the previous line.  If this causes the line to
exceed 80 characters in length, then the parameters should wrap.

[ziran.sun, 2014/02/27 15:38:11]

Done.

   ClearPreviewedForm();
 
   // Only preview the data if it is a profile.
   if (identifier > 0)
     FillAutofillFormData(identifier, true);
+  // Preview Autocomplete field

[Ilya Sherman, 2014/02/22 05:59:51]

nit: This comment is redundant with the code; please remove it.

+  else if (identifier == WebAutofillClient::MenuItemIDAutocompleteEntry) {
+    autofill_driver_->RendererShouldPreviewAutoCompleteNode(value);
+  }

[Ilya Sherman, 2014/02/22 05:59:51]

nit: No need for curly braces.

[ziran.sun, 2014/02/27 15:38:11]

Done.

 }
 
 void AutofillExternalDelegate::DidAcceptSuggestion(const base::string16& value,