Introduce ViewRoot to forward 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..0408cb1129ceb0a68802f9665d08bc6b7dca2418
--- /dev/null
+++ b/ui/android/view_client.cc
@@ -0,0 +1,11 @@
+// Copyright 2016 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"
+
+namespace ui {
+
+void ViewClient::OnPhysicalBackingSizeChanged(int width, int height) { }
+
+}  // namespace ui