Put V8 extras into the snapshot

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 4f98293556bbd8d3eca3a15c2361c135477334f2..03d0e51c74b0f7d553e89c250e7e60190d457f21 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -383,12 +383,18 @@ StartupData V8::CreateSnapshotDataBlob(const char* custom_source) {
       }
     }
     if (!context.IsEmpty()) {
-      // Make sure all builtin scripts are cached.
       {
         HandleScope scope(isolate);
+
+        // Make sure all builtin scripts are cached.
         for (int i = 0; i < i::Natives::GetBuiltinsCount(); i++) {
           internal_isolate->bootstrapper()->SourceLookup<i::Natives>(i);
         }
+
+        // Make sure all extra scripts are cached.
+        for (int i = 0; i < i::ExtraNatives::GetBuiltinsCount(); i++) {
+          internal_isolate->bootstrapper()->SourceLookup<i::ExtraNatives>(i);
+        }
       }
       // If we don't do this then we end up with a stray root pointing at the
       // context even after we have disposed of the context.