Dart Timeline improvements

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index ebb96e8649d117fd2929f5a1875056b0b3e6a8b9..e980f0930b44c520818725eea6c0eb708d5dde17 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -5040,6 +5040,14 @@ RawString* Api::GetEnvironmentValue(Thread* thread, const String& name) {
       return Symbols::False().raw();
     }
 
+    if (name.Equals(Symbols::DartVMProduct())) {
+#ifdef PRODUCT
+      return Symbols::True().raw();
+#else
+      return Symbols::False().raw();
+#endif
+    }
+
     const String& prefix = Symbols::DartLibrary();
     if (name.StartsWith(prefix)) {
       const String& library_name =