Revert of Remove InputMethodEventHandler.

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..085f9d13e8c2b0c804828e4201dc35b73d621ead
--- /dev/null
+++ b/ash/ime/input_method_event_handler.cc
@@ -0,0 +1,37 @@
+// 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_)
+    return;
+  input_method_->DispatchKeyEvent(event);
+  event->StopPropagation();
+}
+
+}  // namespace ash