Upstream injected JavaScript for the iOS web layer

ios/web/web_state/js/resources/base.js

Index: ios/web/web_state/js/resources/base.js
diff --git a/ios/web/web_state/js/resources/base.js b/ios/web/web_state/js/resources/base.js
new file mode 100644
index 0000000000000000000000000000000000000000..97b9622cc9c38bc1f7bf0f431e8179102ad1d87c
--- /dev/null
+++ b/ios/web/web_state/js/resources/base.js
@@ -0,0 +1,13 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This file adheres to closure-compiler conventions in order to enable
+// compilation with ADVANCED_OPTIMIZATIONS. In particular, members that are to
+// be accessed externally should be specified in this['style'] as opposed to
+// this.style because member identifiers are minified by default.
+// See http://goo.gl/FwOgy
+
+// This object is checked on the main app to know when to inject (or not).
+window['__gCrWeb'] = {};
+