[ChromeOS] Show autofill popup after keyboard (if any) is shown.

ui/views/controls/prefix_selector.cc

Index: ui/views/controls/prefix_selector.cc
diff --git a/ui/views/controls/prefix_selector.cc b/ui/views/controls/prefix_selector.cc
index 7e23aa96beb926e8e6eb515d560f8e3a270f531f..f9b78803921a32181c1a71776bdd7c31e2753c84 100644
--- a/ui/views/controls/prefix_selector.cc
+++ b/ui/views/controls/prefix_selector.cc
@@ -154,6 +154,9 @@ bool PrefixSelector::IsEditingCommandEnabled(int command_id) {
 void PrefixSelector::ExecuteEditingCommand(int command_id) {
 }
 
+void PrefixSelector::OnKeyboardBoundsUnchanged() {
+}
+
 void PrefixSelector::OnTextInput(const base::string16& text) {
   // Small hack to filter out 'tab' and 'enter' input, as the expectation is
   // that they are control characters and will not affect the currently-active