Infrastructure for reading V8's initial snapshot from external files

mojo/apps/js/standalone_main.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_util.h"
 #include "base/i18n/icu_util.h"
 #include "mojo/application/application_runner_chromium.h"
 #include "mojo/apps/js/application_delegate_impl.h"
 #include "mojo/apps/js/js_app.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
 
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+#include "gin/public/isolate_holder.h"
+#endif
+
 namespace mojo {
 namespace apps {
 
 class StandaloneJSApp : public JSApp {
  public:
   StandaloneJSApp(ApplicationDelegateImpl* app_delegate_impl,
                   const base::FilePath& path)
       : JSApp(app_delegate_impl),
         path_(path) {
   }
@@ skipping 18 matching lines @@
       StartJSApp(js_app.Pass());
     }
   }
 };
 
 }  // namespace apps
 }  // namespace mojo
 
 MojoResult MojoMain(MojoHandle shell_handle) {
   base::i18n::InitializeICU();
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+  gin::IsolateHolder::LoadV8Snapshot();
+#endif
   mojo::ApplicationRunnerChromium runner(
       new mojo::apps::StandaloneApplicationDelegateImpl());
   return runner.Run(shell_handle);
 }