Add an API to let the embedder associate arbitrary data with a v8::Context.

src/api.cc

Index: src/api.cc
===================================================================
--- src/api.cc	(revision 12669)
+++ src/api.cc	(working copy)
@@ -792,6 +792,29 @@
 }
 
 
+void Context::SetEmbedderData(void* ptr) {
+  i::Handle<i::Context> env = Utils::OpenHandle(this);
+  i::Isolate* isolate = env->GetIsolate();
+  if (IsDeadCheck(isolate, "v8::Context::SetEmbedderData()")) return;
+  Local<Value> data = External::Wrap(ptr);
+  i::Handle<i::Object> raw_data = Utils::OpenHandle(*data);
+  ASSERT(env->IsNativeContext());
+  env->set_embedder_data(*raw_data);
+}
+
+
+void* Context::GetEmbedderData() {
+  i::Handle<i::Context> env = Utils::OpenHandle(this);
+  i::Isolate* isolate = env->GetIsolate();
+  if (IsDeadCheck(isolate, "v8::Context::GetEmbedderData()")) {
+    return 0;
+  }
+  i::Handle<i::Object> result(env->embedder_data(), isolate);
+  Local<Value> data = Utils::ToLocal(result);
+  return External::Unwrap(data);
+}
+
+
 i::Object** v8::HandleScope::RawClose(i::Object** value) {
   if (!ApiCheck(!is_closed_,
                 "v8::HandleScope::Close()",