Use EventHandler for IME

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 7e55fe8dae1bdbd089b28b617d81a48c4536711f..c67beb3aa69e9a500fe459271a0377f8db8a388d 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -29,6 +29,7 @@
 #include "ash/gpu_support.h"
 #include "ash/high_contrast/high_contrast_controller.h"
 #include "ash/host/ash_window_tree_host_init_params.h"
+#include "ash/ime/input_method_event_handler.h"
 #include "ash/keyboard_uma_event_filter.h"
 #include "ash/magnifier/magnification_controller.h"
 #include "ash/magnifier/partial_magnification_controller.h"
@@ -673,6 +674,7 @@ Shell::~Shell() {
   // Please keep in same order as in Init() because it's easy to miss one.
   if (window_modality_controller_)
     window_modality_controller_.reset();
+  RemovePreTargetHandler(display_controller_->input_method_event_handler());
 #if defined(OS_CHROMEOS)
   RemovePreTargetHandler(magnifier_key_scroll_handler_.get());
   magnifier_key_scroll_handler_.reset();
@@ -918,6 +920,8 @@ void Shell::Init(const ShellInitParams& init_params) {
   accelerator_controller_.reset(new AcceleratorController);
   maximize_mode_controller_.reset(new MaximizeModeController());
 
+  AddPreTargetHandler(display_controller_->input_method_event_handler());
+
 #if defined(OS_CHROMEOS)
   magnifier_key_scroll_handler_ = MagnifierKeyScroller::CreateHandler();
   AddPreTargetHandler(magnifier_key_scroll_handler_.get());