Infrastructure for reading V8's initial snapshot from external files

mojo/apps/js/content_handler_main.cc

Index: mojo/apps/js/content_handler_main.cc
diff --git a/mojo/apps/js/content_handler_main.cc b/mojo/apps/js/content_handler_main.cc
index 1edf10dfe814888668b2d3a3aefde90be96a2e5c..3c59459c285c82282da3a6a4cbeb639b71b81449 100644
--- a/mojo/apps/js/content_handler_main.cc
+++ b/mojo/apps/js/content_handler_main.cc
@@ -12,6 +12,10 @@
 #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 {
 
@@ -40,6 +44,9 @@ class ContentHandlerApplicationDelegateImpl : public ApplicationDelegateImpl {
 }  // namespace mojo
 
 MojoResult MojoMain(MojoHandle shell_handle) {
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+  gin::IsolateHolder::LoadV8Snapshot();
+#endif
   mojo::ApplicationRunnerChromium runner(
       new mojo::apps::ContentHandlerApplicationDelegateImpl());
   return runner.Run(shell_handle);