Support Promises event-based instrumentation on backend.

Source/core/inspector/PromiseTracker.h

+// 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.
+
+#ifndef PromiseTracker_h
+#define PromiseTracker_h
+
+#include "wtf/HashMap.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/RefPtr.h"
+#include "wtf/Vector.h"
+#include <v8.h>
+
+namespace blink {
+
+class ScriptState;
+
+class PromiseTracker {
+    WTF_MAKE_NONCOPYABLE(PromiseTracker);
+public:
+    PromiseTracker();
+    ~PromiseTracker();
+
+    bool isEnabled() const { return m_isEnabled; }
+    void enable();
+    void disable();
+
+    void clear();
+
+    void didReceiveV8PromiseEvent(ScriptState*, v8::Handle<v8::Object> promise, v8::Handle<v8::Value> parentPromise, int status);
+
+    class PromiseData;

[aandrey, 2014/08/28 14:05:53]

make this and below private? (if needed remove anonymous namespace around
PromiseDataWrapper)

+
+    typedef Vector<RefPtr<PromiseData> > PromiseDataVector;
+    typedef HashMap<int, PromiseDataVector> PromiseDataMap;
+
+private:
+    bool m_isEnabled;
+    PromiseDataMap m_promiseDataMap;
+};
+
+} // namespace blink
+
+#endif // !defined(PromiseTracker_h)