Make counter and histogram related callbacks part of the Isolate::CreateParams.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index fd17edfc568cc16e1f20595c0f96f8d2ba32bd90..31707d999d4cff41b70648b7d4168a22b8fc3420 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -6803,6 +6803,18 @@ Isolate* Isolate::New(const Isolate::CreateParams& params) {
     isolate->logger()->SetCodeEventHandler(kJitCodeEventDefault,
                                            params.code_event_handler);
   }
+  if (params.counter_lookup_callback) {
+    v8_isolate->SetCounterFunction(params.counter_lookup_callback);
+  }
+
+  if (params.create_histogram_callback) {
+    v8_isolate->SetCreateHistogramFunction(params.create_histogram_callback);
+  }
+
+  if (params.add_histogram_sample_callback) {
+    v8_isolate->SetAddHistogramSampleFunction(
+        params.add_histogram_sample_callback);
+  }
   SetResourceConstraints(isolate, params.constraints);
   // TODO(jochen): Once we got rid of Isolate::Current(), we can remove this.
   Isolate::Scope isolate_scope(v8_isolate);