Infrastructure for reading V8's initial snapshot from external files

mojo/apps/js/content_handler_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/i18n/icu_util.h"
 #include "mojo/application/application_runner_chromium.h"
 #include "mojo/apps/js/application_delegate_impl.h"
 #include "mojo/apps/js/content_handler_impl.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/public/cpp/application/interface_factory_impl.h"
 #include "mojo/services/public/interfaces/content_handler/content_handler.mojom.h"
 
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+#include "gin/public/isolate_holder.h"
+#endif
+
 namespace mojo {
 namespace apps {
 
 class ContentHandlerApplicationDelegateImpl : public ApplicationDelegateImpl {
  public:
   ContentHandlerApplicationDelegateImpl() : content_handler_factory_(this) {
   }
 
  private:
   virtual bool ConfigureIncomingConnection(
       ApplicationConnection* connection) override {
     connection->AddService(&content_handler_factory_);
     return true;
   }
 
   InterfaceFactoryImplWithContext<ContentHandlerImpl, ApplicationDelegateImpl>
       content_handler_factory_;
 };
 
 }  // 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::ContentHandlerApplicationDelegateImpl());
   return runner.Run(shell_handle);
 }