[Chromecast] Add input support.

chromecast/browser/cast_window_manager.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 "chromecast/browser/cast_window_manager.h"
+
+namespace chromecast {
+namespace shell {
+
+CastWindowManager::CastWindowManager() { }
+
+CastWindowManager::~CastWindowManager() { }
+
+void CastWindowManager::StartWindowManager() { }
+
+void CastWindowManager::AddWebContents(content::WebContents* web_contents,
+                                       bool is_overlay, bool is_transparent) { }
+
+}  // namespace shell
+}  // namespace chromecast