Add Debugger.inspect. 1976 here we come!

sdk/lib/_internal/compiler/js_lib/developer_patch.dart

Index: sdk/lib/_internal/compiler/js_lib/developer_patch.dart
diff --git a/sdk/lib/_internal/compiler/js_lib/developer_patch.dart b/sdk/lib/_internal/compiler/js_lib/developer_patch.dart
index 0e38bd55dafd302493790ac368341453f29e4795..a6087a1a1791ca544169b2944203ca03f288c8bc 100644
--- a/sdk/lib/_internal/compiler/js_lib/developer_patch.dart
+++ b/sdk/lib/_internal/compiler/js_lib/developer_patch.dart
@@ -23,3 +23,10 @@ bool debugger({bool when: true, String msg}) {
   }
   return when;
 }
+
+/// Send a reference to [object] to any attached debuggers so they may open an
+/// inspector on the object. Returns the argument.
+@patch
+inspect(object) {
+  return object;
+}