[remoting android] Add and build host code.

remoting/host/continue_window_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/logging.h"
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "remoting/host/continue_window.h"
+
+namespace remoting {
+
+namespace {
+
+class ContinueWindowAndroid : public ContinueWindow {
+ public:
+  ContinueWindowAndroid() {}
+
+ protected:
+  // ContinueWindow overrides.
+  void ShowUi() override {
+    NOTIMPLEMENTED();
+  }
+
+  void HideUi() override {
+    NOTIMPLEMENTED();
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(ContinueWindowAndroid);
+};
+
+}  // namespace
+
+// static
+std::unique_ptr<HostWindow> HostWindow::CreateContinueWindow() {
+  return base::WrapUnique(new ContinueWindowAndroid());
+}
+
+}  // namespace remoting