Infrastructure for reading V8's initial snapshot from external files

mojo/apps/js/application_delegate_impl.cc

Index: mojo/apps/js/application_delegate_impl.cc
diff --git a/mojo/apps/js/application_delegate_impl.cc b/mojo/apps/js/application_delegate_impl.cc
index f197c3cc0eb82e2eaa357783c94b32dfb9ef6709..136b01ebf059fb3b9619aebadfc1dbf5c6a37a65 100644
--- a/mojo/apps/js/application_delegate_impl.cc
+++ b/mojo/apps/js/application_delegate_impl.cc
@@ -18,6 +18,10 @@ ApplicationDelegateImpl::ApplicationDelegateImpl()
 
 void ApplicationDelegateImpl::Initialize(ApplicationImpl* app) {
   application_impl_ = app;
+
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+  gin::IsolateHolder::LoadV8Snapshot();
+#endif
   gin::IsolateHolder::Initialize(gin::IsolateHolder::kStrictMode,
                                  gin::ArrayBufferAllocator::SharedInstance());
 }