Expose some sky_viewer plumbing to allow for reuse

sky/viewer/viewer.cc

 // Copyright 2014 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/files/file_path.h"
-#include "base/message_loop/message_loop.h"
-#include "base/threading/thread.h"
 #include "mojo/application/application_runner_chromium.h"
-#include "mojo/common/tracing_impl.h"
-#include "mojo/icu/icu.h"
 #include "mojo/public/c/system/main.h"
-#include "mojo/public/cpp/application/application_connection.h"
-#include "mojo/public/cpp/application/application_delegate.h"
-#include "mojo/public/cpp/application/application_impl.h"
-#include "mojo/public/cpp/application/interface_factory_impl.h"
-#include "mojo/services/content_handler/public/interfaces/content_handler.mojom.h"
-#include "sky/engine/public/web/Sky.h"
-#include "sky/services/platform/platform_impl.h"
 #include "sky/viewer/content_handler_impl.h"
-#include "sky/viewer/document_view.h"
-#include "sky/viewer/runtime_flags.h"
+#include "sky/viewer/sky_viewer_base.h"
 
 namespace sky {
 
-class Viewer : public mojo::ApplicationDelegate,
-               public mojo::InterfaceFactory<mojo::ContentHandler> {
+class Viewer : public SkyViewerBase {
  public:
   Viewer() {}
 
-  ~Viewer() override { blink::shutdown(); }
+  ~Viewer() override {}
 
  private:
-  // Overridden from ApplicationDelegate:
-  void Initialize(mojo::ApplicationImpl* app) override {
-    RuntimeFlags::Initialize(app);
-
-    mojo::NetworkServicePtr network_service;
-    app->ConnectToService("mojo:network_service", &network_service);
-    platform_impl_.reset(new PlatformImpl(network_service.Pass()));
-    blink::initialize(platform_impl_.get());
-
-    mojo::icu::Initialize(app);
-    tracing_.Initialize(app);
-  }
-
-  bool ConfigureIncomingConnection(
-      mojo::ApplicationConnection* connection) override {
-    connection->AddService<mojo::ContentHandler>(this);
-    return true;
-  }
-
   // Overridden from InterfaceFactory<ContentHandler>
   void Create(mojo::ApplicationConnection* connection,
               mojo::InterfaceRequest<mojo::ContentHandler> request) override {
     new ContentHandlerImpl(request.Pass());
   }
 
-  scoped_ptr<PlatformImpl> platform_impl_;
-  mojo::TracingImpl tracing_;
-
   DISALLOW_COPY_AND_ASSIGN(Viewer);
 };
 
 }  // namespace sky
 
 MojoResult MojoMain(MojoHandle application_request) {
   mojo::ApplicationRunnerChromium runner(new sky::Viewer);
   return runner.Run(application_request);
 }