Revert of Remove prefixed Pointer Lock API.

LayoutTests/http/tests/resources/pointer-lock/iframe-common-prefixed.js

Index: LayoutTests/http/tests/resources/pointer-lock/iframe-common-prefixed.js
diff --git a/LayoutTests/http/tests/resources/pointer-lock/iframe-common-prefixed.js b/LayoutTests/http/tests/resources/pointer-lock/iframe-common-prefixed.js
new file mode 100644
index 0000000000000000000000000000000000000000..2190747aab753450435397685dcefb6b9432e4ce
--- /dev/null
+++ b/LayoutTests/http/tests/resources/pointer-lock/iframe-common-prefixed.js
@@ -0,0 +1,27 @@
+function thisFileName()
+{
+    return window.location.href.split("/").pop();
+}
+
+window.onmessage = function (messageEvent) {
+    switch (messageEvent.data[0]) {
+    case "eval":
+        eval(messageEvent.data[1]);
+        break;
+    case "pass message down":
+        iframe = document.getElementsByTagName("iframe")[0];
+        iframe.contentWindow.postMessage(messageEvent.data.slice(1), "*");
+        break;
+    default:
+        // Pass all other messages up to parent.
+        parent.postMessage(messageEvent.data, "*");
+    }
+}
+
+document.onwebkitpointerlockchange = function () {
+    parent.postMessage(thisFileName() + " onwebkitpointerlockchange, document.webkitPointerLockElement = " + document.webkitPointerLockElement, "*");
+}
+
+document.onwebkitpointerlockerror = function () {
+    parent.postMessage(thisFileName() + " onwebkitpointerlockerror", "*");
+}