Add Timeline to dart:developer

sdk/lib/_internal/js_runtime/lib/developer_patch.dart

Index: sdk/lib/_internal/js_runtime/lib/developer_patch.dart
diff --git a/sdk/lib/_internal/js_runtime/lib/developer_patch.dart b/sdk/lib/_internal/js_runtime/lib/developer_patch.dart
index 8349d14fef3218e819d85fc7e23711f74f42de23..fbcd8cb55ee9aedebfbd040502486076b593ffc1 100644
--- a/sdk/lib/_internal/js_runtime/lib/developer_patch.dart
+++ b/sdk/lib/_internal/js_runtime/lib/developer_patch.dart
@@ -44,3 +44,18 @@ ServiceExtensionHandler _lookupExtension(String method) {
 _registerExtension(String method, ServiceExtensionHandler handler) {
   _extensions[method] = handler;
 }
+
+@patch
+int _getTraceClock() {
+  // TODO.
+  return _clockValue++;
+}
+
+@patch
+void _reportCompleteEvent(int start,
+                          int end,
+                          String category,
+                          String name,
+                          String argumentsAsJson) {
+  // TODO.
+}