Support Promises instrumentation on backend.

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 243b660e64c0f6fd6b81691311de667c99100989..687bacb78cc53d1f4a7c4bafa97cef170ff47b06 100644
--- a/Source/core/inspector/InspectorDebuggerAgent.h
+++ b/Source/core/inspector/InspectorDebuggerAgent.h
@@ -37,6 +37,7 @@
 #include "core/inspector/ConsoleAPITypes.h"
 #include "core/inspector/InjectedScript.h"
 #include "core/inspector/InspectorBaseAgent.h"
+#include "core/inspector/PromiseTracker.h"
 #include "core/inspector/ScriptBreakpoint.h"
 #include "core/inspector/ScriptDebugListener.h"
 #include "wtf/Forward.h"
@@ -161,6 +162,10 @@ public:
     void didPostPromiseTask(ExecutionContext*, ExecutionContextTask*, bool isResolved);
     void willPerformPromiseTask(ExecutionContext*, ExecutionContextTask*);
     void didPerformPromiseTask();
+    bool isPromiseTrackerEnabled();
+    void didCreatePromise(const ScriptObject& promise);
+    void didUpdatePromiseParent(const ScriptObject& promise, const ScriptObject& parentPromise);
+    void didUpdatePromiseState(const ScriptObject& promise, V8PromiseCustom::PromiseState, const ScriptValue& result);
     bool canBreakProgram();
     void breakProgram(InspectorFrontend::Debugger::Reason::Enum breakReason, PassRefPtr<JSONObject> data);
     void scriptExecutionBlockedByCSP(const String& directiveText);
@@ -248,6 +253,7 @@ private:
     bool m_skipAllPauses;
     OwnPtr<ScriptRegexp> m_cachedSkipStackRegExp;
     AsyncCallStackTracker m_asyncCallStackTracker;
+    PromiseTracker m_promiseTracker;
 };
 
 } // namespace WebCore