Rename 'dart:debugger' to 'dart:developer'

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

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Patch file for dart:developer library.
+
+import 'dart:_js_helper' show patch;
+import 'dart:_foreign_helper' show JS;
+
+/// If [when] is true, stop the program as if a breakpoint where hit at the
+/// following statement. Returns the value of [when]. Some debuggers may
+/// display [msg].
+/// NOTE: When invoked, the isolate will not return until a debugger
+/// continues execution. When running in the Dart VM the behaviour is the same
+/// regardless of whether or not a debugger is connected. When compiled to
+/// JavaScript, this uses the "debugger" statement, and behaves exactly as
+/// that does.
+@patch
+@ForceInline()
+bool debugger({bool when: true, String msg}) {
+  if (when) {
+    JS('', 'debugger');
+  }
+  return when;
+}