Add GetTextDirection to ui::TextInputClient API.

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 1ba5feb1ba8ee57dd60a39e9e77c7b49b4285328..3a6e5cec6ab3d48d371a6558553ff60b2b440ae0 100644
--- a/ui/views/controls/prefix_selector.cc
+++ b/ui/views/controls/prefix_selector.cc
@@ -64,6 +64,10 @@ ui::TextInputMode PrefixSelector::GetTextInputMode() const {
   return ui::TEXT_INPUT_MODE_DEFAULT;
 }
 
+base::i18n::TextDirection PrefixSelector::GetTextDirection() const {
+  return base::i18n::UNKNOWN_DIRECTION;
+}
+
 int PrefixSelector::GetTextInputFlags() const {
   return 0;
 }