[promisehook] Implement PromiseHook

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index e5f1766a831f47a52197e459b4858518dc6089ca..1fc4feef4feeecc7c6466d36cc1bc7a92df1340b 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -1125,12 +1125,12 @@ class Isolate {
   int GetNextUniqueSharedFunctionInfoId() { return next_unique_sfi_id_++; }
 #endif
 
-  Address is_promisehook_enabled_address() {
-    return reinterpret_cast<Address>(&is_promisehook_enabled_);
+  Address promise_hook_address() {
+    return reinterpret_cast<Address>(&promise_hook_);
   }
-  bool IsPromiseHookEnabled() { return is_promisehook_enabled_; }
-  void EnablePromiseHook();
-  void DisablePromiseHook();
+  void SetPromiseHook(PromiseHook hook);
+  void RunPromiseHook(PromiseHookType type, Handle<JSPromise> promise,
+                      Handle<Object> parent);
 
   // Support for dynamically disabling tail call elimination.
   Address is_tail_call_elimination_enabled_address() {
@@ -1373,7 +1373,7 @@ class Isolate {
   bool initialized_from_snapshot_;
 
   // True if PromiseHook feature is enabled.
-  bool is_promisehook_enabled_;
+  PromiseHook promise_hook_;
 
   // True if ES2015 tail call elimination feature is enabled.
   bool is_tail_call_elimination_enabled_;