[remoting android] Add and build host code.

remoting/host/local_input_monitor_android.cc

+// 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 "base/memory/ptr_util.h"
+#include "remoting/host/local_input_monitor.h"
+
+namespace remoting {
+
+namespace {
+
+class LocalInputMonitorAndroid : public LocalInputMonitor {
+ public:
+  LocalInputMonitorAndroid() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(LocalInputMonitorAndroid);
+};
+
+}  // namespace
+
+std::unique_ptr<LocalInputMonitor> LocalInputMonitor::Create(
+    scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
+    scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
+    scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
+    base::WeakPtr<ClientSessionControl> client_session_control) {
+  return base::WrapUnique(new LocalInputMonitorAndroid());
+}
+
+}  // namespace remoting