inspector: fixed V8InspectorClient::currentTimeMS

On inspector side inside V8 we assume that this method should
return number of ms since epoch.

PR-URL: #21917
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>

src/inspector_agent.cc

@@ -187,8 +187,6 @@ static int StartDebugSignalHandler() {
 #endif  // _WIN32
 
 
-// Used in NodeInspectorClient::currentTimeMS() below.
-const int NANOS_PER_MSEC = 1000000;
 const int CONTEXT_GROUP_ID = 1;
 
 class ChannelImpl final : public v8_inspector::V8Inspector::Channel,
@@ -593,7 +591,7 @@ class NodeInspectorClient : public V8InspectorClient {
   }
 
   double currentTimeMS() override {
-    return uv_hrtime() * 1.0 / NANOS_PER_MSEC;
+    return env_->isolate_data()->platform()->CurrentClockTimeMillis();
   }
 
   node::Environment* env_;