DevTools: prepare to unify Network and CPU throttling UI

third_party/WebKit/Source/devtools/front_end/components/CPUThrottlingManager.js

-// Copyright 2017 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.SDKModelObserver<!SDK.EmulationModel>}
- */
-Components.CPUThrottlingManager = class extends Common.Object {
-  constructor() {
-    super();
-    this._throttlingRate = 1;  // No throttling
-    /** @type {!Set<!UI.ToolbarComboBox>} */
-    this._controls = new Set();
-    this._rates = [1, 2, 5, 10, 20];
-    SDK.targetManager.observeModels(SDK.EmulationModel, this);
-  }
-
-  /**
-   * @param {number} index
-   */
-  _setRateIndex(index) {
-    this._throttlingRate = this._rates[index];
-    for (var emulationModel of SDK.targetManager.models(SDK.EmulationModel))
-      emulationModel.setCPUThrottlingRate(this._throttlingRate);
-    var icon = null;
-    if (this._throttlingRate !== 1) {
-      Host.userMetrics.actionTaken(Host.UserMetrics.Action.CpuThrottlingEnabled);
-      icon = UI.Icon.create('smallicon-warning');
-      icon.title = Common.UIString('CPU throttling is enabled');
-    }
-    for (var control of this._controls)
-      control.setSelectedIndex(index);
-    UI.inspectorView.setPanelIcon('timeline', icon);
-    this.dispatchEventToListeners(Components.CPUThrottlingManager.Events.RateChanged);
-  }
-
-  /**
-   * @return {number}
-   */
-  rate() {
-    return this._throttlingRate;
-  }
-
-  /**
-   * @override
-   * @param {!SDK.EmulationModel} emulationModel
-   */
-  modelAdded(emulationModel) {
-    if (this._throttlingRate !== 1)
-      emulationModel.setCPUThrottlingRate(this._throttlingRate);
-  }
-
-  /**
-   * @override
-   * @param {!SDK.EmulationModel} emulationModel
-   */
-  modelRemoved(emulationModel) {
-  }
-
-  /**
-   * @return {!UI.ToolbarComboBox}
-   */
-  createControl() {
-    var control = new UI.ToolbarComboBox(event => this._setRateIndex(event.target.selectedIndex));
-    this._controls.add(control);
-    var currentRate = this._throttlingRate;
-
-    for (var i = 0; i < this._rates.length; ++i) {
-      var rate = this._rates[i];
-      var title = rate === 1 ? Common.UIString('No throttling') : Common.UIString('%d\xD7 slowdown', rate);
-      var option = control.createOption(title);
-      control.addOption(option);
-      if (currentRate === rate)
-        control.setSelectedIndex(i);
-    }
-    return control;
-  }
-
-  /**
-   * @param {!UI.ToolbarComboBox} control
-   */
-  disposeControl(control) {
-    this._controls.delete(control);
-  }
-};
-
-/** @enum {symbol} */
-Components.CPUThrottlingManager.Events = {
-  RateChanged: Symbol('RateChanged')
-};