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 "bindings/core/v8/ScopedPersistent.h"
+#include "core/inspector/ScriptCallFrame.h"
+#include "wtf/HashMap.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/RefPtr.h"
+#include "wtf/Vector.h"
+#include "wtf/WeakPtr.h"
+#include <v8.h>
+
+namespace blink {
+
+class ScriptState;
+
+class PromiseTracker {
+    WTF_MAKE_NONCOPYABLE(PromiseTracker);
+public:
+    PromiseTracker() : m_isEnabled(false) { }
+
+    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 : public RefCounted<PromiseData> {

[yurys, 2014/08/26 14:06:36]

Why is this public?

[Alexandra Mikhaylova, 2014/08/28 13:29:46]

It's used in PromiseDataWrapper that's wrapped in an unnamed namespace, left
only declaration here.

+    public:
+        PromiseData(v8::Isolate*, int promiseHash, v8::Handle<v8::Object> promise);
+
+        int promiseHash() const { return m_promiseHash; }
+        ScopedPersistent<v8::Object>& promise() { return m_promise; }
+
+    private:
+        friend class PromiseTracker;
+
+        int m_promiseHash;
+
+        ScopedPersistent<v8::Object> m_promise;
+        ScriptCallFrame m_callFrame;
+        ScopedPersistent<v8::Object> m_parentPromise;
+        int m_status;
+
+        WeakPtrFactory<PromiseData> m_weakPtrFactory;
+    };
+
+    typedef Vector<RefPtr<PromiseData> > PromiseDataVector;
+    typedef HashMap<int, PromiseDataVector> PromiseDataMap;

[yurys, 2014/08/26 14:06:36]

Why not use HashMap<Handle<Promise>, PromiseData> ?

[Alexandra Mikhaylova, 2014/08/28 13:29:46]

We're going to migrate to WeakMap in future, using this ad hoc implementation of
hashmap for now.

+
+private:
+    bool m_isEnabled;
+    PromiseDataMap m_promiseDataMap;
+};
+
+} // namespace blink
+
+#endif // !defined(PromiseTracker_h)