Use EventHandler for IME

ash/ime/input_method_event_handler.cc

Index: ash/ime/input_method_event_handler.cc
diff --git a/ash/ime/input_method_event_handler.cc b/ash/ime/input_method_event_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6cac9bba9798341eab45abd9b333062342a51634
--- /dev/null
+++ b/ash/ime/input_method_event_handler.cc
@@ -0,0 +1,36 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ash/ime/input_method_event_handler.h"
+
+#include "ui/base/ime/input_method.h"
+#include "ui/events/event.h"
+
+namespace ash {
+
+////////////////////////////////////////////////////////////////////////////////
+// InputMethodEventHandler, public:
+
+InputMethodEventHandler::InputMethodEventHandler(ui::InputMethod* input_method)
+    : input_method_(input_method), post_ime_(false) {
+}
+
+InputMethodEventHandler::~InputMethodEventHandler() {
+}
+
+void InputMethodEventHandler::SetPostIME(bool post_ime) {
+  post_ime_ = post_ime;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// InputMethodEventHandler, EventFilter implementation:
+
+void InputMethodEventHandler::OnKeyEvent(ui::KeyEvent* event) {
+  // Never send synthesized key event.
+  if (event->flags() & ui::EF_IS_SYNTHESIZED)
+    return;
+  if (!post_ime_ && input_method_->DispatchKeyEvent(*event))
+    event->StopPropagation();
+}
+}