Introduce ViewRoot forwarding input/view events to native

ui/android/view_client.cc

Index: ui/android/view_client.cc
diff --git a/ui/android/view_client.cc b/ui/android/view_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ac847876a272626fee9a1dba767ff5715d5491f0
--- /dev/null
+++ b/ui/android/view_client.cc
@@ -0,0 +1,13 @@
+// Copyright 2017 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/view_client.h"
+#include "ui/events/android/motion_event_android.h"
+
+namespace ui {
+
+bool ViewClient::OnTouchEvent(const MotionEventAndroid& event,
+                              bool is_touch_handle_event) { return false; }
+
+}  // namespace ui