Ensure default isolate is present in Context::New().

R=danno@chromium.org
BUG=chromium:118686
TEST=Run chrome with --single-process.

Review URL: https://chromiumcodereview.appspot.com/9949008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11233 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/api.cc

@@ -4287,6 +4287,7 @@ Persistent<Context> v8::Context::New(
     v8::ExtensionConfiguration* extensions,
     v8::Handle<ObjectTemplate> global_template,
     v8::Handle<Value> global_object) {
+  i::Isolate::EnsureDefaultIsolate();
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::Context::New()");
   LOG_API(isolate, "Context::New");