[autofill] Adding new API to request an interactive autocomplete UI flow.

chrome/browser/autofill/autofill_manager.cc

Index: chrome/browser/autofill/autofill_manager.cc
diff --git a/chrome/browser/autofill/autofill_manager.cc b/chrome/browser/autofill/autofill_manager.cc
index dbf2037af209eb8fb6227890b5ca853243ef79c5..b5a321f31e9ec2c2ee9c60135c7660ec37e90cba 100644
--- a/chrome/browser/autofill/autofill_manager.cc
+++ b/chrome/browser/autofill/autofill_manager.cc
@@ -360,6 +360,8 @@ bool AutofillManager::OnMessageReceived(const IPC::Message& message) {
                         OnShowPasswordSuggestions)
     IPC_MESSAGE_HANDLER(AutofillHostMsg_SetDataList,
                         OnSetDataList)
+    IPC_MESSAGE_HANDLER(AutofillHostMsg_RequestAutocomplete,
+                        OnRequestAutocomplete)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -797,6 +799,10 @@ void AutofillManager::OnSetDataList(const std::vector<string16>& values,
   }
 }
 
+void AutofillManager::OnRequestAutocomplete(const FormData& form) {
+  // TODO(dbeam): implement interactive autocomplete UI.
+}
+
 void AutofillManager::OnLoadedServerPredictions(
     const std::string& response_xml) {
   // Parse and store the server predictions.