DevTools: Switch to using fast stack iterator to collect stacks during timeline recording.

third_party/WebKit/Source/devtools/front_end/es6.js

Index: third_party/WebKit/Source/devtools/front_end/es6.js
diff --git a/third_party/WebKit/Source/devtools/front_end/es6.js b/third_party/WebKit/Source/devtools/front_end/es6.js
index 34a94495ddef37d05e366df43506a4231348bf0a..7b1ea79662dafddc11e744d820569efc89bb2dc6 100644
--- a/third_party/WebKit/Source/devtools/front_end/es6.js
+++ b/third_party/WebKit/Source/devtools/front_end/es6.js
@@ -986,6 +986,25 @@ Promise.prototype.then = function(opt_onFulfilled, opt_onRejected) {};
 Promise.prototype.catch = function(onRejected) {};
 
 
+/**
+ * @param {T} value
+ * @param {number=} start
+ * @param {number=} end
+ * @this {!Array<T>}
+ * @template T
+ */
+Array.prototype.fill = function(value, start, end) {}
+
+
+/**
+ * @param {function(this:S,T,number,!Array<T>)} callback
+ * @param {?S=} thisArg
+ * @this {!Array<T>}
+ * @template T,S
+ */
+Array.prototype.find = function(callback, thisArg) {}
+
+
 /** @return {!Array<number>} */
 Array.prototype.keys;