aura: Fix IME interaction in content-shell in chromeos build.

ui/wm/test/wm_test_helper.h

Index: ui/wm/test/wm_test_helper.h
diff --git a/ui/wm/test/wm_test_helper.h b/ui/wm/test/wm_test_helper.h
index 71bde3edcb2c5a76c43f8d34fb75406188859dbe..fbcf85e54432e31976d1ebcfaf0873694ebc1677 100644
--- a/ui/wm/test/wm_test_helper.h
+++ b/ui/wm/test/wm_test_helper.h
@@ -13,6 +13,7 @@
 #include "ui/aura/window_tree_host.h"
 
 namespace aura {
+class InputMethodGlue;
 class Window;
 class WindowTreeHost;
 namespace client {
@@ -52,7 +53,7 @@ class WMTestHelper : public aura::client::WindowTreeClient {
 
  private:
   std::unique_ptr<aura::WindowTreeHost> host_;
-
+  std::unique_ptr<aura::InputMethodGlue> input_method_glue_;
   std::unique_ptr<wm::CompoundEventFilter> root_window_event_filter_;
   std::unique_ptr<aura::client::DefaultCaptureClient> capture_client_;
   std::unique_ptr<aura::client::FocusClient> focus_client_;