Expose some sky_viewer plumbing to allow for reuse

sky/viewer/content_handler_impl.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 "sky/viewer/content_handler_impl.h"
 
 #include "base/bind.h"
 #include "mojo/public/cpp/application/connect.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 #include "mojo/services/network/public/interfaces/network_service.mojom.h"
 #include "sky/viewer/document_view.h"
+#include "sky/viewer/sky_loader.h"
 
 namespace sky {
 
 class SkyApplication : public mojo::Application {
  public:
   SkyApplication(mojo::InterfaceRequest<mojo::Application> application,
                  mojo::URLResponsePtr response)
       : binding_(this, application.Pass()),
         initial_response_(response.Pass()) {}
 
   void Initialize(mojo::ShellPtr shell,
                   mojo::Array<mojo::String> args,
                   const mojo::String& url) override {
     shell_ = shell.Pass();
-    mojo::ServiceProviderPtr service_provider;
-    shell_->ConnectToApplication("mojo:network_service",
-                                 mojo::GetProxy(&service_provider), nullptr);
-    mojo::ConnectToService(service_provider.get(), &network_service_);
+    sky_loader_.reset(new SkyLoader(shell_.get(), initial_response_.Pass()));
   }
 
   void AcceptConnection(const mojo::String& requestor_url,
                         mojo::InterfaceRequest<mojo::ServiceProvider> services,
                         mojo::ServiceProviderPtr exposed_services,
                         const mojo::String& url) override {
-    if (initial_response_) {
-      OnResponseReceived(mojo::URLLoaderPtr(), services.Pass(),
-                         exposed_services.Pass(), initial_response_.Pass());
-    } else {
-      mojo::URLLoaderPtr loader;
-      network_service_->CreateURLLoader(mojo::GetProxy(&loader));
-      mojo::URLRequestPtr request(mojo::URLRequest::New());
-      request->url = url;
-      request->auto_follow_redirects = true;
-
-      // |loader| will be pass to the OnResponseReceived method through a
-      // callback. Because order of evaluation is undefined, a reference to the
-      // raw pointer is needed.
-      mojo::URLLoader* raw_loader = loader.get();
-      raw_loader->Start(
-          request.Pass(),
-          base::Bind(&SkyApplication::OnResponseReceived,
-                     base::Unretained(this), base::Passed(&loader),
-                     base::Passed(&services), base::Passed(&exposed_services)));
-    }
+    sky_loader_->LoadApplication(services.Pass(), exposed_services.Pass(), url);
   }
 
   void RequestQuit() override {
     mojo::RunLoop::current()->Quit();
   }
 
  private:
-  void OnResponseReceived(
-      mojo::URLLoaderPtr loader,
-      mojo::InterfaceRequest<mojo::ServiceProvider> services,
-      mojo::ServiceProviderPtr exposed_services,
-      mojo::URLResponsePtr response) {
-    new DocumentView(services.Pass(), exposed_services.Pass(), response.Pass(),
-                     shell_.get());
-  }
-
   mojo::StrongBinding<mojo::Application> binding_;
   mojo::ShellPtr shell_;
-  mojo::NetworkServicePtr network_service_;
   mojo::URLResponsePtr initial_response_;
+  scoped_ptr<SkyLoader> sky_loader_;
 };
 
 ContentHandlerImpl::ContentHandlerImpl(
     mojo::InterfaceRequest<mojo::ContentHandler> request)
     : binding_(this, request.Pass()) {
 }
 
 ContentHandlerImpl::~ContentHandlerImpl() {
 }
 
 void ContentHandlerImpl::StartApplication(
     mojo::InterfaceRequest<mojo::Application> application,
     mojo::URLResponsePtr response) {
   new SkyApplication(application.Pass(), response.Pass());
 }
 
 }  // namespace sky