DevTools: make throttler with timeout respect the timeout.

third_party/WebKit/Source/devtools/front_end/common/Throttler.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.
 
 /**
  * @constructor
  * @param {number} timeout
  */
 WebInspector.Throttler = function(timeout)
 {
     this._timeout = timeout;
     this._isRunningProcess = false;
     this._asSoonAsPossible = false;
     /** @type {?function():(!Promise.<?>)} */
     this._process = null;
+    this._lastCompleteTime = 0;
 }
 
 WebInspector.Throttler.prototype = {
     _processCompleted: function()
     {
+        this._lastCompleteTime = window.performance.now();
         this._isRunningProcess = false;
         if (this._process)
             this._innerSchedule(false);
         this._processCompletedForTests();
     },
 
     _processCompletedForTests: function()
     {
         // For sniffing in tests.
     },
@@ skipping 15 matching lines @@
      * @param {function():(!Promise.<?>)} process
      * @param {boolean=} asSoonAsPossible
      */
     schedule: function(process, asSoonAsPossible)
     {
         // Deliberately skip previous process.
         this._process = process;
 
         // Run the first scheduled task instantly.
         var hasScheduledTasks = !!this._processTimeout || this._isRunningProcess;
-        asSoonAsPossible = !!asSoonAsPossible || !hasScheduledTasks;
+        var okToFire = window.performance.now() - this._lastCompleteTime > this._timeout;
+        asSoonAsPossible = !!asSoonAsPossible || (!hasScheduledTasks && okToFire);
 
         var forceTimerUpdate = asSoonAsPossible && !this._asSoonAsPossible;
         this._asSoonAsPossible = this._asSoonAsPossible || asSoonAsPossible;
 
         this._innerSchedule(forceTimerUpdate);
     },
 
+    flush: function()
+    {
+        if (this._process)
+            this._onTimeout();
+    },
+
     /**
      * @param {boolean} forceTimerUpdate
      */
     _innerSchedule: function(forceTimerUpdate)
     {
         if (this._isRunningProcess)
             return;
         if (this._processTimeout && !forceTimerUpdate)
             return;
         if (this._processTimeout)
@@ skipping 17 matching lines @@
      * @return {number}
      */
     _setTimeout: function(operation, timeout)
     {
         return setTimeout(operation, timeout);
     }
 }
 
 /** @typedef {function(!Error=)} */
 WebInspector.Throttler.FinishCallback;