DevTools: use async operation id instead of AsyncCallChain

Source/core/inspector/InspectorDebuggerAgent.h

Index: Source/core/inspector/InspectorDebuggerAgent.h
diff --git a/Source/core/inspector/InspectorDebuggerAgent.h b/Source/core/inspector/InspectorDebuggerAgent.h
index 9ae2efbd68d0edf7bb5c4693dbcadfcf8ff5c80d..351ef1b288d8ec14207a72b0e17812fa7d3dfa30 100644
--- a/Source/core/inspector/InspectorDebuggerAgent.h
+++ b/Source/core/inspector/InspectorDebuggerAgent.h
@@ -49,6 +49,7 @@
 namespace blink {
 
 class AsyncCallChain;
+class AsyncCallStack;
 class ConsoleMessage;
 class InjectedScript;
 class InjectedScriptManager;
@@ -172,11 +173,11 @@ public:
 
     // Async call stacks implementation
     PassRefPtrWillBeRawPtr<ScriptAsyncCallStack> currentAsyncStackTraceForConsole();
-    PassRefPtrWillBeRawPtr<AsyncCallChain> traceAsyncOperationStarting(const String& description);
-    void traceAsyncCallbackStarting(v8::Isolate*, PassRefPtrWillBeRawPtr<AsyncCallChain>);
+    int traceAsyncOperationStarting(const String& description);
+    void traceAsyncCallbackStarting(v8::Isolate*, int operationId);
     const AsyncCallChain* currentAsyncCallChain() const;
     void traceAsyncCallbackCompleted();
-    void traceAsyncOperationCompleted(AsyncCallChain*);
+    void traceAsyncOperationCompleted(int operationId);
     bool trackingAsyncCalls() const { return m_maxAsyncCallStackDepth; }
 
     class AsyncCallTrackingListener : public WillBeGarbageCollectedMixin {
@@ -219,6 +220,7 @@ private:
     PassRefPtr<TypeBuilder::Debugger::StackTrace> currentAsyncStackTrace();
 
     void resetAsyncCallTracker();
+    int createAsyncCallChain(PassRefPtrWillBeRawPtr<AsyncCallStack>);
     void didCreateAsyncCallChain(AsyncCallChain*);
 
     void changeJavaScriptRecursionLevel(int step);
@@ -286,6 +288,9 @@ private:
     OwnPtrWillBeMember<V8AsyncCallTracker> m_v8AsyncCallTracker;
     OwnPtrWillBeMember<PromiseTracker> m_promiseTracker;
 
+    using AsyncOperationIdToAsyncCallChain = WillBeHeapHashMap<int, RefPtrWillBeMember<AsyncCallChain>>;
+    AsyncOperationIdToAsyncCallChain m_asyncOperations;
+    int m_nextAsyncOperationId;
     WillBeHeapHashSet<RefPtrWillBeMember<AsyncCallChain> > m_asyncOperationsForStepInto;
     unsigned m_maxAsyncCallStackDepth;
     RefPtrWillBeMember<AsyncCallChain> m_currentAsyncCallChain;