IndexedDB Observers

third_party/WebKit/Source/bindings/modules/v8/V8IDBObserverCallback.h

+// Copyright 2016 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.
+
+#ifndef V8IDBObserverCallback_h
+#define V8IDBObserverCallback_h
+
+#include "bindings/core/v8/ActiveDOMCallback.h"
+#include "bindings/core/v8/DOMWrapperWorld.h"
+#include "bindings/core/v8/ScopedPersistent.h"
+#include "core/CoreExport.h"
+#include "modules/indexeddb/IDBObserverCallback.h"
+
+namespace blink {
+
+class V8IDBObserverCallback final : public IDBObserverCallback, public ActiveDOMCallback {
+    USING_GARBAGE_COLLECTED_MIXIN(V8IDBObserverCallback);
+
+public:
+    CORE_EXPORT V8IDBObserverCallback(v8::Local<v8::Function>, v8::Local<v8::Object>, ScriptState*);

[Marijn Kruisselbrink, 2016/06/02 23:51:24]

Code in modules/ should use MODULES_EXPORT rather than CORE_EXPORT. I'm not sure
you need either of them here though, but it's also generally more common to
export entire types rather than just exporting the constructor.

[palakj1, 2016/06/03 01:21:52]

Removed CORE_EXPORT

+    ~V8IDBObserverCallback() override;
+
+    DECLARE_VIRTUAL_TRACE();
+
+    ExecutionContext* getExecutionContext() const override { return ContextLifecycleObserver::getExecutionContext(); }
+private:
+    static void setWeakCallback(const v8::WeakCallbackInfo<V8IDBObserverCallback>&);

[dmurph, 2016/06/02 23:48:37]

Do we need this?

[palakj1, 2016/06/03 01:21:52]

I had copied this peice of code from Intersection observer blindly. But
interestingly enough, post my checkout of the code, this segment seems to have
been removed from the original codebase. 
I am not certain if it's safe to remove it from our code as well. It's used here
V8IDBObserverCallback.cpp:22   m_callback.setWeak(this, &setWeakCallback);

+
+    ScopedPersistent<v8::Function> m_callback;
+    RefPtr<ScriptState> m_scriptState;
+};
+
+} // namespace blink
+#endif // V8IDBObserverCallback_h