Upstream injected JavaScript for the iOS web layer

ios/web/web_state/js/resources/message_dynamic_ui.js

Index: ios/web/web_state/js/resources/message_dynamic_ui.js
diff --git a/ios/web/web_state/js/resources/message_dynamic_ui.js b/ios/web/web_state/js/resources/message_dynamic_ui.js
new file mode 100644
index 0000000000000000000000000000000000000000..5d179541bd1ca349ce50f09fc6a7600507429369
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+++ b/ios/web/web_state/js/resources/message_dynamic_ui.js
@@ -0,0 +1,38 @@
+// 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 UIWebView.
+
+/**
+ * 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) {
+    // The technique requires the document to be present. If it is not, the
+    // messages will be sent once the document object is created.
+    if (!document || !document.body) {
+      // This happens in rare occasions early in the page cycle. It is
+      // possible to create a body element indirectly here, but it has side
+      // effects such as blocking page redirection. The safest solution is to
+      // try again in 1/10th of a second.
+      window.setTimeout(__gCrWeb.message.invokeQueues, 100);
+      return;
+    }
+
+    var frame = document.createElement('iframe');
+    frame.style.display = 'none';
+    frame.src = queueObject.scheme + '://' + __gCrWeb.windowId + '#' +
+        encodeURIComponent(__gCrWeb.common.JSONStringify(queueObject.queue));
+    queueObject.reset();
+    document.body.appendChild(frame);
+    document.body.removeChild(frame);
+  };
+}