Support snapshots in sky_shell (again)

sky/shell/ui/engine.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/ui/engine.h"
 
 #include "base/bind.h"
 #include "base/trace_event/trace_event.h"
 #include "mojo/public/cpp/application/connect.h"
 #include "sky/engine/public/platform/WebInputEvent.h"
@@ skipping 200 matching lines @@
   RunFromLibrary(url);
 }
 
 void Engine::RunFromFile(const mojo::String& main,
                          const mojo::String& package_root) {
   dart_library_provider_.reset(
       new DartLibraryProviderFiles(base::FilePath(package_root)));
   RunFromLibrary(main);
 }
 
-void Engine::RunFromSnapshot(mojo::ScopedDataPipeConsumerHandle snapshot) {
-  // TODO(abarth): Implement.
+void Engine::RunFromSnapshot(const mojo::String& url,
+                             mojo::ScopedDataPipeConsumerHandle snapshot) {
+  CloseWebViewIfNeeded();
+  sky_view_ = blink::SkyView::Create(this);
+  sky_view_->RunFromSnapshot(blink::WebString::fromUTF8(url), snapshot.Pass());
+  UpdateSkyViewSize();
 }
 
 void Engine::LoadUsingWebView(const mojo::String& mojo_url) {
   GURL url(mojo_url);
   DCHECK(blink::WebView::shouldUseWebView(url));
 
   if (sky_view_)
     sky_view_ = nullptr;
 
   LOG(WARNING) << ".sky support is deprecated, please use .dart for main()";
@@ skipping 53 matching lines @@
 
 void Engine::DidNavigateLocally(const mojo::String& url) {
 }
 
 void Engine::RequestNavigateHistory(int32_t delta) {
   NOTIMPLEMENTED();
 }
 
 }  // namespace shell
 }  // namespace sky