Revert of [DevTools] Remove methods on Common.Event.

third_party/WebKit/Source/devtools/front_end/animation/AnimationTimeline.js

 // Copyright (c) 2015 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.
 /**
  * @implements {SDK.TargetManager.Observer}
  * @unrestricted
  */
 Animation.AnimationTimeline = class extends UI.VBox {
   constructor() {
     super(true);
@@ skipping 94 matching lines @@
     this._timelineScrubberLine = this._timelineScrubber.createChild('div', 'animation-scrubber-line');
     this._timelineScrubberLine.createChild('div', 'animation-scrubber-head');
     this._timelineScrubber.createChild('div', 'animation-time-overlay');
     return this._timelineScrubber;
   }
 
   _createHeader() {
     var toolbarContainer = this.contentElement.createChild('div', 'animation-timeline-toolbar-container');
     var topToolbar = new UI.Toolbar('animation-timeline-toolbar', toolbarContainer);
     var clearButton = new UI.ToolbarButton(Common.UIString('Clear all'), 'largeicon-clear');
-    clearButton.addEventListener(UI.ToolbarButton.Events.Click, this._reset.bind(this));
+    clearButton.addEventListener('click', this._reset.bind(this));
     topToolbar.appendToolbarItem(clearButton);
     topToolbar.appendSeparator();
 
     this._pauseButton = new UI.ToolbarToggle(Common.UIString('Pause all'), 'largeicon-pause', 'largeicon-resume');
-    this._pauseButton.addEventListener(UI.ToolbarButton.Events.Click, this._togglePauseAll.bind(this));
+    this._pauseButton.addEventListener('click', this._togglePauseAll.bind(this));
     topToolbar.appendToolbarItem(this._pauseButton);
 
     var playbackRateControl = toolbarContainer.createChild('div', 'animation-playback-rate-control');
     this._playbackRateButtons = [];
     for (var playbackRate of Animation.AnimationTimeline.GlobalPlaybackRates) {
       var button = playbackRateControl.createChild('div', 'animation-playback-rate-button');
       button.textContent = playbackRate ? Common.UIString(playbackRate * 100 + '%') : Common.UIString('Pause');
       button.playbackRate = playbackRate;
       button.addEventListener('click', this._setPlaybackRate.bind(this, playbackRate));
       button.title = Common.UIString('Set speed to ') + button.textContent;
       this._playbackRateButtons.push(button);
     }
     this._updatePlaybackControls();
 
     this._previewContainer = this.contentElement.createChild('div', 'animation-timeline-buffer');
     this._popoverHelper = new UI.PopoverHelper(this._previewContainer, true);
     this._popoverHelper.initializeCallbacks(
         this._getPopoverAnchor.bind(this), this._showPopover.bind(this), this._onHidePopover.bind(this));
     this._popoverHelper.setTimeout(0);
     var emptyBufferHint = this.contentElement.createChild('div', 'animation-timeline-buffer-hint');
     emptyBufferHint.textContent = Common.UIString('Listening for animations...');
     var container = this.contentElement.createChild('div', 'animation-timeline-header');
     var controls = container.createChild('div', 'animation-controls');
     this._currentTime = controls.createChild('div', 'animation-timeline-current-time monospace');
 
     var toolbar = new UI.Toolbar('animation-controls-toolbar', controls);
     this._controlButton = new UI.ToolbarToggle(Common.UIString('Replay timeline'), 'largeicon-replay-animation');
     this._controlState = Animation.AnimationTimeline._ControlState.Replay;
     this._controlButton.setToggled(true);
-    this._controlButton.addEventListener(UI.ToolbarButton.Events.Click, this._controlButtonToggle.bind(this));
+    this._controlButton.addEventListener('click', this._controlButtonToggle.bind(this));
     toolbar.appendToolbarItem(this._controlButton);
 
     var gridHeader = container.createChild('div', 'animation-grid-header');
     UI.installDragHandle(
         gridHeader, this._repositionScrubber.bind(this), this._scrubberDragMove.bind(this),
         this._scrubberDragEnd.bind(this), 'text');
     container.appendChild(this._createScrubber());
     UI.installDragHandle(
         this._timelineScrubberLine, this._scrubberDragStart.bind(this), this._scrubberDragMove.bind(this),
         this._scrubberDragEnd.bind(this), 'col-resize');
@@ skipping 573 matching lines @@
   static parse(text) {
     var match = text.match(/^steps\((\d+), (start|middle)\)$/);
     if (match)
       return new Animation.AnimationTimeline.StepTimingFunction(parseInt(match[1], 10), match[2]);
     match = text.match(/^steps\((\d+)\)$/);
     if (match)
       return new Animation.AnimationTimeline.StepTimingFunction(parseInt(match[1], 10), 'end');
     return null;
   }
 };