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diff --git a/dom/canvas/test/webgl-conf/checkout/deqp/temp_externs/es6.js b/dom/canvas/test/webgl-conf/checkout/deqp/temp_externs/es6.js
new file mode 100644
index 0000000000..4afb5777a5
--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/deqp/temp_externs/es6.js
@@ -0,0 +1,856 @@
+/*
+ * Copyright 2014 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for ECMAScript 6.
+ * @see http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts
+ * @see https://www.khronos.org/registry/typedarray/specs/latest/
+ * @externs
+ */
+
+// TODO(johnlenz): symbol should be a primitive type.
+/** @typedef {?} */
+var symbol;
+
+/**
+ * @param {string} description
+ * @return {symbol}
+ */
+function Symbol(description) {}
+
+/** @const {symbol} */
+Symbol.iterator;
+
+
+/**
+ * @interface
+ * @template VALUE
+ */
+function Iterable() {}
+
+// TODO(johnlenz): remove this when the compiler understands "symbol" natively
+/**
+ * @return {Iterator.<VALUE>}
+ * @suppress {externsValidation}
+ */
+Iterable.prototype[Symbol.iterator] = function() {};
+
+
+
+// TODO(johnlenz): Iterator should be a templated record type.
+/**
+ * @interface
+ * @template VALUE
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/The_Iterator_protocol
+ */
+function Iterator() {}
+
+/**
+ * @param {VALUE=} value
+ * @return {{value:VALUE, done:boolean}}
+ */
+Iterator.prototype.next;
+
+
+/**
+ * @constructor
+ * @see http://people.mozilla.org/~jorendorff/es6-draft.html#sec-generator-objects
+ * @implements {Iterator<VALUE>}
+ * @template VALUE
+ */
+var Generator = function() {};
+
+/**
+ * @param {?=} opt_value
+ * @return {{value:VALUE, done:boolean}}
+ * @override
+ */
+Generator.prototype.next = function(opt_value) {};
+
+/**
+ * @param {VALUE} value
+ * @return {{value:VALUE, done:boolean}}
+ */
+Generator.prototype.return = function(value) {};
+
+/**
+ * @param {?} exception
+ * @return {{value:VALUE, done:boolean}}
+ */
+Generator.prototype.throw = function(exception) {};
+
+
+// TODO(johnlenz): Array should be Iterable.
+
+
+
+/**
+ * @param {number} value
+ * @return {number}
+ * @nosideeffects
+ */
+Math.log10 = function(value) {};
+
+/**
+ * @param {number} value
+ * @return {number}
+ * @nosideeffects
+ */
+Math.log2 = function(value) {};
+
+/**
+ * @param {number} value
+ * @return {number}
+ * @nosideeffects
+ */
+Math.log1p = function(value) {};
+
+/**
+ * @param {number} value
+ * @return {number}
+ * @nosideeffects
+ */
+Math.expm1 = function(value) {};
+
+/**
+ * @param {number} value
+ * @return {number}
+ * @nosideeffects
+ */
+Math.cosh = function(value) {};
+
+/**
+ * @param {number} value
+ * @return {number}
+ * @nosideeffects
+ */
+Math.sinh = function(value) {};
+
+/**
+ * @param {number} value
+ * @return {number}
+ * @nosideeffects
+ */
+Math.tanh = function(value) {};
+
+/**
+ * @param {number} value
+ * @return {number}
+ * @nosideeffects
+ */
+Math.acosh = function(value) {};
+
+/**
+ * @param {number} value
+ * @return {number}
+ * @nosideeffects
+ */
+Math.asinh = function(value) {};
+
+/**
+ * @param {number} value
+ * @return {number}
+ * @nosideeffects
+ */
+Math.atanh = function(value) {};
+
+/**
+ * @param {number} value
+ * @return {number}
+ * @nosideeffects
+ */
+Math.trunc = function(value) {};
+
+/**
+ * @param {number} value
+ * @return {number}
+ * @nosideeffects
+ */
+Math.sign = function(value) {};
+
+/**
+ * @param {number} value
+ * @return {number}
+ * @nosideeffects
+ */
+Math.cbrt = function(value) {};
+
+/**
+ * @param {number} value1
+ * @param {...number} var_args
+ * @return {number}
+ * @nosideeffects
+ * @see http://people.mozilla.org/~jorendorff/es6-draft.html#sec-math.hypot
+ */
+Math.hypot = function(value1, var_args) {};
+
+
+/**
+ * @param {*} a
+ * @param {*} b
+ * @return {boolean}
+ * @see http://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.is
+ */
+Object.is;
+
+
+/**
+ * Returns a language-sensitive string representation of this number.
+ * @param {(string|!Array<string>)=} opt_locales
+ * @param {Object=} opt_options
+ * @return {string}
+ * @nosideeffects
+ * @see https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString
+ * @see http://www.ecma-international.org/ecma-402/1.0/#sec-13.2.1
+ * @override
+ */
+Number.prototype.toLocaleString = function(opt_locales, opt_options) {};
+
+
+/**
+ * @see http://dev.w3.org/html5/postmsg/
+ * @interface
+ */
+function Transferable() {}
+
+/**
+ * @param {number} length The length in bytes
+ * @constructor
+ * @noalias
+ * @throws {Error}
+ * @nosideeffects
+ * @implements {Transferable}
+ */
+function ArrayBuffer(length) {}
+
+/** @type {number} */
+ArrayBuffer.prototype.byteLength;
+
+/**
+ * @param {number} begin
+ * @param {number=} opt_end
+ * @return {!ArrayBuffer}
+ * @nosideeffects
+ */
+ArrayBuffer.prototype.slice = function(begin, opt_end) {};
+
+
+/**
+ * @constructor
+ * @noalias
+ */
+function ArrayBufferView() {}
+
+/** @type {!ArrayBuffer} */
+ArrayBufferView.prototype.buffer;
+
+/** @type {number} */
+ArrayBufferView.prototype.byteOffset;
+
+/** @type {number} */
+ArrayBufferView.prototype.byteLength;
+
+
+/**
+ * @param {number|ArrayBufferView|Array.<number>|ArrayBuffer} length or array
+ *     or buffer
+ * @param {number=} opt_byteOffset
+ * @param {number=} opt_length
+ * @extends {ArrayBufferView}
+ * @constructor
+ * @noalias
+ * @throws {Error}
+ * @modifies {arguments} If the user passes a backing array, then indexed
+ *     accesses will modify the backing array. JSCompiler does not model
+ *     this well. In other words, if you have:
+ *     <code>
+ *     var x = new ArrayBuffer(1);
+ *     var y = new Int8Array(x);
+ *     y[0] = 2;
+ *     </code>
+ *     JSCompiler will not recognize that the last assignment modifies x.
+ *     We workaround this by marking all these arrays as @modifies {arguments},
+ *     to introduce the possibility that x aliases y.
+ */
+function Int8Array(length, opt_byteOffset, opt_length) {}
+
+/** @type {number} */
+Int8Array.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Int8Array.prototype.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Int8Array.prototype.length;
+
+/**
+ * @param {ArrayBufferView|Array.<number>} array
+ * @param {number=} opt_offset
+ */
+Int8Array.prototype.set = function(array, opt_offset) {};
+
+/**
+ * @param {number} begin
+ * @param {number=} opt_end
+ * @return {!Int8Array}
+ * @nosideeffects
+ */
+Int8Array.prototype.subarray = function(begin, opt_end) {};
+
+
+/**
+ * @param {number|ArrayBufferView|Array.<number>|ArrayBuffer} length or array
+ *     or buffer
+ * @param {number=} opt_byteOffset
+ * @param {number=} opt_length
+ * @extends {ArrayBufferView}
+ * @constructor
+ * @noalias
+ * @throws {Error}
+ * @modifies {arguments}
+ */
+function Uint8Array(length, opt_byteOffset, opt_length) {}
+
+/** @type {number} */
+Uint8Array.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Uint8Array.prototype.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Uint8Array.prototype.length;
+
+/**
+ * @param {ArrayBufferView|Array.<number>} array
+ * @param {number=} opt_offset
+ */
+Uint8Array.prototype.set = function(array, opt_offset) {};
+
+/**
+ * @param {number} begin
+ * @param {number=} opt_end
+ * @return {!Uint8Array}
+ * @nosideeffects
+ */
+Uint8Array.prototype.subarray = function(begin, opt_end) {};
+
+
+/**
+ * @param {number|ArrayBufferView|Array.<number>|ArrayBuffer} length or array
+ *     or buffer
+ * @param {number=} opt_byteOffset
+ * @param {number=} opt_length
+ * @extends {ArrayBufferView}
+ * @constructor
+ * @noalias
+ * @throws {Error}
+ * @modifies {arguments}
+ */
+function Uint8ClampedArray(length, opt_byteOffset, opt_length) {}
+
+/** @type {number} */
+Uint8ClampedArray.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Uint8ClampedArray.prototype.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Uint8ClampedArray.prototype.length;
+
+/**
+ * @param {ArrayBufferView|Array.<number>} array
+ * @param {number=} opt_offset
+ */
+Uint8ClampedArray.prototype.set = function(array, opt_offset) {};
+
+/**
+ * @param {number} begin
+ * @param {number=} opt_end
+ * @return {!Uint8ClampedArray}
+ * @nosideeffects
+ */
+Uint8ClampedArray.prototype.subarray = function(begin, opt_end) {};
+
+
+/**
+ * @typedef {Uint8ClampedArray}
+ * @deprecated CanvasPixelArray has been replaced by Uint8ClampedArray
+ *     in the latest spec.
+ * @see http://www.w3.org/TR/2dcontext/#imagedata
+ */
+var CanvasPixelArray;
+
+
+/**
+ * @param {number|ArrayBufferView|Array.<number>|ArrayBuffer} length or array
+ *     or buffer
+ * @param {number=} opt_byteOffset
+ * @param {number=} opt_length
+ * @extends {ArrayBufferView}
+ * @constructor
+ * @noalias
+ * @throws {Error}
+ * @modifies {arguments}
+ */
+function Int16Array(length, opt_byteOffset, opt_length) {}
+
+/** @type {number} */
+Int16Array.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Int16Array.prototype.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Int16Array.prototype.length;
+
+/**
+ * @param {ArrayBufferView|Array.<number>} array
+ * @param {number=} opt_offset
+ */
+Int16Array.prototype.set = function(array, opt_offset) {};
+
+/**
+ * @param {number} begin
+ * @param {number=} opt_end
+ * @return {!Int16Array}
+ * @nosideeffects
+ */
+Int16Array.prototype.subarray = function(begin, opt_end) {};
+
+
+/**
+ * @param {number|ArrayBufferView|Array.<number>|ArrayBuffer} length or array
+ *     or buffer
+ * @param {number=} opt_byteOffset
+ * @param {number=} opt_length
+ * @extends {ArrayBufferView}
+ * @constructor
+ * @noalias
+ * @throws {Error}
+ * @modifies {arguments}
+ */
+function Uint16Array(length, opt_byteOffset, opt_length) {}
+
+/** @type {number} */
+Uint16Array.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Uint16Array.prototype.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Uint16Array.prototype.length;
+
+/**
+ * @param {ArrayBufferView|Array.<number>} array
+ * @param {number=} opt_offset
+ */
+Uint16Array.prototype.set = function(array, opt_offset) {};
+
+/**
+ * @param {number} begin
+ * @param {number=} opt_end
+ * @return {!Uint16Array}
+ * @nosideeffects
+ */
+Uint16Array.prototype.subarray = function(begin, opt_end) {};
+
+
+/**
+ * @param {number|ArrayBufferView|Array.<number>|ArrayBuffer} length or array
+ *     or buffer
+ * @param {number=} opt_byteOffset
+ * @param {number=} opt_length
+ * @extends {ArrayBufferView}
+ * @constructor
+ * @noalias
+ * @throws {Error}
+ * @modifies {arguments}
+ */
+function Int32Array(length, opt_byteOffset, opt_length) {}
+
+/** @type {number} */
+Int32Array.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Int32Array.prototype.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Int32Array.prototype.length;
+
+/**
+ * @param {ArrayBufferView|Array.<number>} array
+ * @param {number=} opt_offset
+ */
+Int32Array.prototype.set = function(array, opt_offset) {};
+
+/**
+ * @param {number} begin
+ * @param {number=} opt_end
+ * @return {!Int32Array}
+ * @nosideeffects
+ */
+Int32Array.prototype.subarray = function(begin, opt_end) {};
+
+
+/**
+ * @param {number|ArrayBufferView|Array.<number>|ArrayBuffer} length or array
+ *     or buffer
+ * @param {number=} opt_byteOffset
+ * @param {number=} opt_length
+ * @extends {ArrayBufferView}
+ * @constructor
+ * @noalias
+ * @throws {Error}
+ * @modifies {arguments}
+ */
+function Uint32Array(length, opt_byteOffset, opt_length) {}
+
+/** @type {number} */
+Uint32Array.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Uint32Array.prototype.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Uint32Array.prototype.length;
+
+/**
+ * @param {ArrayBufferView|Array.<number>} array
+ * @param {number=} opt_offset
+ */
+Uint32Array.prototype.set = function(array, opt_offset) {};
+
+/**
+ * @param {number} begin
+ * @param {number=} opt_end
+ * @return {!Uint32Array}
+ * @nosideeffects
+ */
+Uint32Array.prototype.subarray = function(begin, opt_end) {};
+
+
+/**
+ * @param {number|ArrayBufferView|Array.<number>|ArrayBuffer} length or array
+ *     or buffer
+ * @param {number=} opt_byteOffset
+ * @param {number=} opt_length
+ * @extends {ArrayBufferView}
+ * @constructor
+ * @noalias
+ * @throws {Error}
+ * @modifies {arguments}
+ */
+function Float32Array(length, opt_byteOffset, opt_length) {}
+
+/** @type {number} */
+Float32Array.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Float32Array.prototype.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Float32Array.prototype.length;
+
+/**
+ * @param {ArrayBufferView|Array.<number>} array
+ * @param {number=} opt_offset
+ */
+Float32Array.prototype.set = function(array, opt_offset) {};
+
+/**
+ * @param {number} begin
+ * @param {number=} opt_end
+ * @return {!Float32Array}
+ * @nosideeffects
+ */
+Float32Array.prototype.subarray = function(begin, opt_end) {};
+
+
+/**
+ * @param {number|ArrayBufferView|Array.<number>|ArrayBuffer} length or array
+ *     or buffer
+ * @param {number=} opt_byteOffset
+ * @param {number=} opt_length
+ * @extends {ArrayBufferView}
+ * @constructor
+ * @noalias
+ * @throws {Error}
+ * @modifies {arguments}
+ */
+function Float64Array(length, opt_byteOffset, opt_length) {}
+
+/** @type {number} */
+Float64Array.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Float64Array.prototype.BYTES_PER_ELEMENT;
+
+/** @type {number} */
+Float64Array.prototype.length;
+
+/**
+ * @param {ArrayBufferView|Array.<number>} array
+ * @param {number=} opt_offset
+ */
+Float64Array.prototype.set = function(array, opt_offset) {};
+
+/**
+ * @param {number} begin
+ * @param {number=} opt_end
+ * @return {!Float64Array}
+ * @nosideeffects
+ */
+Float64Array.prototype.subarray = function(begin, opt_end) {};
+
+
+/**
+ * @param {ArrayBuffer} buffer
+ * @param {number=} opt_byteOffset
+ * @param {number=} opt_byteLength
+ * @extends {ArrayBufferView}
+ * @constructor
+ * @noalias
+ * @throws {Error}
+ * @nosideeffects
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Typed_arrays/DataView
+ */
+function DataView(buffer, opt_byteOffset, opt_byteLength) {}
+
+/**
+ * @param {number} byteOffset
+ * @return {number}
+ * @throws {Error}
+ * @nosideeffects
+ */
+DataView.prototype.getInt8 = function(byteOffset) {};
+
+/**
+ * @param {number} byteOffset
+ * @return {number}
+ * @throws {Error}
+ * @nosideeffects
+ */
+DataView.prototype.getUint8 = function(byteOffset) {};
+
+/**
+ * @param {number} byteOffset
+ * @param {boolean=} opt_littleEndian
+ * @return {number}
+ * @throws {Error}
+ * @nosideeffects
+ */
+DataView.prototype.getInt16 = function(byteOffset, opt_littleEndian) {};
+
+/**
+ * @param {number} byteOffset
+ * @param {boolean=} opt_littleEndian
+ * @return {number}
+ * @throws {Error}
+ * @nosideeffects
+ */
+DataView.prototype.getUint16 = function(byteOffset, opt_littleEndian) {};
+
+/**
+ * @param {number} byteOffset
+ * @param {boolean=} opt_littleEndian
+ * @return {number}
+ * @throws {Error}
+ * @nosideeffects
+ */
+DataView.prototype.getInt32 = function(byteOffset, opt_littleEndian) {};
+
+/**
+ * @param {number} byteOffset
+ * @param {boolean=} opt_littleEndian
+ * @return {number}
+ * @throws {Error}
+ * @nosideeffects
+ */
+DataView.prototype.getUint32 = function(byteOffset, opt_littleEndian) {};
+
+/**
+ * @param {number} byteOffset
+ * @param {boolean=} opt_littleEndian
+ * @return {number}
+ * @throws {Error}
+ * @nosideeffects
+ */
+DataView.prototype.getFloat32 = function(byteOffset, opt_littleEndian) {};
+
+/**
+ * @param {number} byteOffset
+ * @param {boolean=} opt_littleEndian
+ * @return {number}
+ * @throws {Error}
+ * @nosideeffects
+ */
+DataView.prototype.getFloat64 = function(byteOffset, opt_littleEndian) {};
+
+/**
+ * @param {number} byteOffset
+ * @param {number} value
+ * @throws {Error}
+ */
+DataView.prototype.setInt8 = function(byteOffset, value) {};
+
+/**
+ * @param {number} byteOffset
+ * @param {number} value
+ * @throws {Error}
+ */
+DataView.prototype.setUint8 = function(byteOffset, value) {};
+
+/**
+ * @param {number} byteOffset
+ * @param {number} value
+ * @param {boolean=} opt_littleEndian
+ * @throws {Error}
+ */
+DataView.prototype.setInt16 = function(byteOffset, value, opt_littleEndian) {};
+
+/**
+ * @param {number} byteOffset
+ * @param {number} value
+ * @param {boolean=} opt_littleEndian
+ * @throws {Error}
+ */
+DataView.prototype.setUint16 = function(byteOffset, value, opt_littleEndian) {};
+
+/**
+ * @param {number} byteOffset
+ * @param {number} value
+ * @param {boolean=} opt_littleEndian
+ * @throws {Error}
+ */
+DataView.prototype.setInt32 = function(byteOffset, value, opt_littleEndian) {};
+
+/**
+ * @param {number} byteOffset
+ * @param {number} value
+ * @param {boolean=} opt_littleEndian
+ * @throws {Error}
+ */
+DataView.prototype.setUint32 = function(byteOffset, value, opt_littleEndian) {};
+
+/**
+ * @param {number} byteOffset
+ * @param {number} value
+ * @param {boolean=} opt_littleEndian
+ * @throws {Error}
+ */
+DataView.prototype.setFloat32 = function(
+    byteOffset, value, opt_littleEndian) {};
+
+/**
+ * @param {number} byteOffset
+ * @param {number} value
+ * @param {boolean=} opt_littleEndian
+ * @throws {Error}
+ */
+DataView.prototype.setFloat64 = function(
+    byteOffset, value, opt_littleEndian) {};
+
+
+/**
+ * @see https://github.com/promises-aplus/promises-spec
+ * @typedef {{then: !Function}}
+ */
+var Thenable;
+
+
+/**
+ * This is not an official DOM interface. It is used to add generic typing
+ * and respective type inference where available.
+ * {@see goog.Thenable} inherits from this making all promises
+ * interoperate.
+ * @interface
+ * @template TYPE
+ */
+var IThenable = function() {};
+
+
+/**
+ * @param {?(function(TYPE):
+ *             (RESULT|IThenable.<RESULT>|Thenable))=} opt_onFulfilled
+ * @param {?(function(*): *)=} opt_onRejected
+ * @return {!IThenable.<RESULT>}
+ * @template RESULT
+ */
+IThenable.prototype.then = function(opt_onFulfilled, opt_onRejected) {};
+
+
+/**
+ * @see https://people.mozilla.org/~jorendorff/es6-draft.html#sec-promise-objects
+ * @param {function(
+ *             function((TYPE|IThenable.<TYPE>|Thenable|null)=),
+ *             function(*=))} resolver
+ * @constructor
+ * @implements {IThenable.<TYPE>}
+ * @template TYPE
+ */
+var Promise = function(resolver) {};
+
+
+/**
+ * @param {(TYPE|IThenable.<TYPE>)=} opt_value
+ * @return {!Promise.<TYPE>}
+ * @template TYPE
+ */
+Promise.resolve = function(opt_value) {};
+
+
+/**
+ * @param {*=} opt_error
+ * @return {!Promise.<?>}
+ */
+Promise.reject = function(opt_error) {};
+
+
+/**
+ * @template T
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise
+ * @param {!Array<T|!Promise<T>>} iterable
+ * @return {!Promise<!Array<T>>}
+ */
+Promise.all = function(iterable) {};
+
+
+/**
+ * @template T
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise
+ * @param {!Array.<T>} iterable
+ * @return {!Promise.<T>}
+ */
+Promise.race = function(iterable) {};
+
+
+/**
+ * @param {?(function(TYPE):
+ *             (RESULT|IThenable.<RESULT>|Thenable))=} opt_onFulfilled
+ * @param {?(function(*): *)=} opt_onRejected
+ * @return {!Promise.<RESULT>}
+ * @template RESULT
+ * @override
+ */
+Promise.prototype.then = function(opt_onFulfilled, opt_onRejected) {};
+
+
+/**
+ * @param {function(*): RESULT} onRejected
+ * @return {!Promise.<RESULT>}
+ * @template RESULT
+ */
+Promise.prototype.catch = function(onRejected) {};