Begin to enable extension APIs in Extension Service Worker.

extensions/renderer/object_backed_native_handler.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/renderer/object_backed_native_handler.h"
 
 #include <stddef.h>
 
 #include "base/logging.h"
 #include "base/memory/linked_ptr.h"
@@ skipping 145 matching lines @@
 
 // static
 bool ObjectBackedNativeHandler::ContextCanAccessObject(
     const v8::Local<v8::Context>& context,
     const v8::Local<v8::Object>& object,
     bool allow_null_context) {
   if (object->IsNull())
     return true;
   if (context == object->CreationContext())
     return true;
+  // TODO(lazyboy): ScriptContextSet isn't available on worker threads. We
+  // should probably use WorkerScriptContextSet somehow.
   ScriptContext* other_script_context =
-      ScriptContextSet::GetContextByObject(object);
+      content::WorkerThread::GetCurrentId() == 0
+          ? ScriptContextSet::GetContextByObject(object)
+          : nullptr;

[lazyboy, 2016/04/18 18:42:14]

FYI, I had to add this b/c accessing ScriptContextSet wouldn't work on worker
threads.

   if (!other_script_context || !other_script_context->web_frame())
     return allow_null_context;
 
   return blink::WebFrame::scriptCanAccess(other_script_context->web_frame());
 }
 
 void ObjectBackedNativeHandler::SetPrivate(v8::Local<v8::Object> obj,
                                            const char* key,
                                            v8::Local<v8::Value> value) {
   SetPrivate(context_->v8_context(), obj, key, value);
@@ skipping 39 matching lines @@
                                               v8::Local<v8::Object> obj,
                                               const char* key) {
   obj->DeletePrivate(context,
                      v8::Private::ForApi(
                          context->GetIsolate(),
                          v8::String::NewFromUtf8(context->GetIsolate(), key)))
       .FromJust();
 }
 
 }  // namespace extensions