Introduce ViewRoot to forward input/view events to native

ui/android/ui_android_jni_registrar.cc

 // Copyright 2014 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 "ui/android/ui_android_jni_registrar.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_registrar.h"
 #include "base/macros.h"
+#include "ui/android/event_handler.h"
 #include "ui/android/resources/resource_manager_impl.h"
 #include "ui/android/screen_android.h"
 #include "ui/android/view_android.h"
 #include "ui/android/window_android.h"
 
 namespace ui {
 
 static base::android::RegistrationMethod kAndroidRegisteredMethods[] = {
     {"DisplayAndroidManager", ui::RegisterScreenAndroid},
+    {"EventHandler", ui::RegisterEventHandler},
     {"ResourceManager", ui::ResourceManagerImpl::RegisterResourceManager},
     {"WindowAndroid", WindowAndroid::RegisterWindowAndroid},
 };
 
 bool RegisterUIAndroidJni(JNIEnv* env) {
   return RegisterNativeMethods(env, kAndroidRegisteredMethods,
                                arraysize(kAndroidRegisteredMethods));
 }
 
 }  // namespace ui