Add support for providers called when the omnibox is focused.

components/omnibox/autocomplete_provider.cc

Index: components/omnibox/autocomplete_provider.cc
diff --git a/components/omnibox/autocomplete_provider.cc b/components/omnibox/autocomplete_provider.cc
index 9238eab557dba1220d9bd363f40692906943081a..e63005ddce5291f10121693dbfead17331a17226 100644
--- a/components/omnibox/autocomplete_provider.cc
+++ b/components/omnibox/autocomplete_provider.cc
@@ -49,6 +49,10 @@ void AutocompleteProvider::Stop(bool clear_cached_results) {
   done_ = true;
 }
 
+bool AutocompleteProvider::ActivatedOnOmniboxFocus() const {
+  return false;
+}
+
 const char* AutocompleteProvider::GetName() const {
   return TypeToString(type_);
 }