Port sky_shell to Linux for testing

sky/shell/platform_view.cc

 // Copyright 2015 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 "sky/shell/platform_view.h"
 #include "base/bind.h"
 #include "base/location.h"
 #include "sky/shell/shell.h"
 #include "base/single_thread_task_runner.h"
 
 namespace sky {
 namespace shell {
 
+PlatformView::Config::Config() {
+}
+
+PlatformView::Config::~Config() {
+}
+
 PlatformView::PlatformView(const PlatformView::Config& config)
     : config_(config), window_(0) {
 }
 
 PlatformView::~PlatformView() {
 }
 
 void PlatformView::ConnectToViewportObserver(
     mojo::InterfaceRequest<ViewportObserver> request) {
   config_.ui_task_runner->PostTask(
       FROM_HERE, base::Bind(&UIDelegate::ConnectToViewportObserver,
                             config_.ui_delegate, base::Passed(&request)));
 }
 
 void PlatformView::SurfaceWasCreated() {
   config_.ui_task_runner->PostTask(
       FROM_HERE, base::Bind(&UIDelegate::OnAcceleratedWidgetAvailable,
                             config_.ui_delegate, window_));
 }
 
 void PlatformView::SurfaceWasDestroyed() {
   config_.ui_task_runner->PostTask(
       FROM_HERE,
       base::Bind(&UIDelegate::OnOutputSurfaceDestroyed, config_.ui_delegate));
 }
 
 }  // namespace shell
 }  // namespace sky