Initialize the embedder data array on v8::Context to three elements

Blink uses three slots, so instead of having to reallocate the array
everytime, make it big enough to begin with.

BUG=none
LOG=n
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/109953004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18335 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/bootstrapper.cc

@@ -1302,7 +1302,7 @@ void Genesis::InitializeGlobal(Handle<GlobalObject> inner_global,
   native_context()->set_out_of_memory(heap->false_value());
 
   // Initialize the embedder data slot.
-  Handle<FixedArray> embedder_data = factory->NewFixedArray(2);
+  Handle<FixedArray> embedder_data = factory->NewFixedArray(3);
   native_context()->set_embedder_data(*embedder_data);
 }