chakrashim: fixing build break by adding new stubs for v8 features

Author: MSLaguana

deps/chakrashim/include/libplatform/v8-tracing.h

@@ -234,6 +234,8 @@ class TracingController
   void StartTracing(TraceConfig* trace_config);
   void StopTracing();
 
+  virtual int64_t CurrentTimestampMicroseconds();
+
  private:
   const uint8_t* GetCategoryGroupEnabledInternal(const char* category_group);
   void UpdateCategoryGroupEnabledFlag(size_t category_index);

deps/chakrashim/src/v8v8.cc

@@ -247,6 +247,10 @@ namespace tracing {
     jsrt::Unimplemented("TracingController");
   }
 
+  int64_t TracingController::CurrentTimestampMicroseconds() {
+    jsrt::Unimplemented("TracingController");
+  }
+
   void TraceConfig::AddIncludedCategory(char const*) {
     jsrt::Unimplemented("TraceConfig");
   }