Upstream injected JavaScript for the iOS web layer

ios/web/web_state/js/resources/message_dynamic_wk.js

Index: ios/web/web_state/js/resources/message_dynamic_wk.js
diff --git a/ios/web/web_state/js/resources/message_dynamic_wk.js b/ios/web/web_state/js/resources/message_dynamic_wk.js
new file mode 100644
index 0000000000000000000000000000000000000000..644f2fa2c50a6e93a1a33fc45ef944cc748a1998
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+++ b/ios/web/web_state/js/resources/message_dynamic_wk.js
@@ -0,0 +1,29 @@
+// Copyright 2014 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.
+
+// Scripts for the message handler for use with WKWebView.
+
+/**
+ * Namespace for this module.
+ */
+__gCrWeb.message_dynamic = {};
+
+/* Beginning of anonymous object. */
+new function() {
+  /**
+   * Sends queued commands to the Objective-C side.
+   * @param {Object} queueObject Queue object containing messages to send.
+   */
+  __gCrWeb.message_dynamic.sendQueue = function(queueObject) {
+    queueObject.queue.forEach(function(command) {
+        var stringifiedMessage = __gCrWeb.common.JSONStringify({
+            "crwCommand": command,
+            "crwWindowId": __gCrWeb.windowId
+        });
+        window.webkit.messageHandlers[queueObject.scheme].postMessage(
+            stringifiedMessage);
+    });
+    queueObject.reset();
+  };
+}