Mojo: Reimplement unicode.js in JavaScript, remove native implementation.

mojo/public/js/bindings/unicode.js

 // 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.
 
-// Module "mojo/public/js/bindings/unicode"
-//
-// Note: This file is for documentation purposes only. The code here is not
-// actually executed. The real module is implemented natively in Mojo.
+/**
+ * Defines functions for translating between JavaScript strings and UTF8 strings
+ * stored in ArrayBuffers. There is much room for optimization in this code if
+ * it proves necessary.
+ */
+define("mojo/public/js/bindings/unicode", function() {
+  /**
+   * Decodes the UTF8 string from the given buffer.
+   * @param {ArrayBufferView} buffer The buffer containing UTF8 string data.
+   * @return {string} The corresponding JavaScript string.
+   */
+  function decodeUtf8String(buffer) {
+    return decodeURIComponent(escape(String.fromCharCode.apply(null, buffer)));
+  }
 
-while (1);
+  /**
+   * Encodes the given JavaScript string into UTF8.
+   * @param {string} str The string to encode.
+   * @param {ArrayBufferView} outputBuffer The buffer to contain the result.
+   * Should be pre-allocated to hold enough space. Use |utf8Length| to determine
+   * how much space is required.
+   * @return {number} The number of bytes written to |outputBuffer|.
+   */
+  function encodeUtf8String(str, outputBuffer) {
+    var utf8String = unescape(encodeURIComponent(str));
+    if (outputBuffer.length < utf8String.length)
+      throw new Error("Buffer too small for encodeUtf8String");
+    for (var i = 0; i < outputBuffer.length && i < utf8String.length; i++)
+      outputBuffer[i] = utf8String.charCodeAt(i);
+    return i;
+  }
 
-/**
- * Decodes the UTF8 string from the given buffer.
- * @param {ArrayBufferView} buffer The buffer containing UTF8 string data.
- * @return {string} The corresponding JavaScript string.
- */
-function decodeUtf8String(buffer) { [native code] }
+  /**
+   * Returns the number of bytes that a UTF8 encoding of the JavaScript string
+   * |str| would occupy.
+   */
+  function utf8Length(str) {
+    var utf8String = unescape(encodeURIComponent(str));
+    return utf8String.length;
+  }
 
-/**
- * Encodes the given JavaScript string into UTF8.
- * @param {string} str The string to encode.
- * @param {ArrayBufferView} outputBuffer The buffer to contain the result.
- * Should be pre-allocated to hold enough space. Use |utf8Length| to determine
- * how much space is required.
- * @return {number} The number of bytes written to |outputBuffer|.
- */
-function encodeUtf8String(str, outputBuffer) { [native code] }
-
-/**
- * Returns the number of bytes that a UTF8 encoding of the JavaScript string
- * |str| would occupy.
- */
-function utf8Length(str) { [native code] }
+  var exports = {};
+  exports.decodeUtf8String = decodeUtf8String;
+  exports.encodeUtf8String = encodeUtf8String;
+  exports.utf8Length = utf8Length;
+  return exports;
+});