[DevTools] Introduce EmulationModel which will encapsulate emulation

third_party/WebKit/Source/devtools/front_end/emulation/TouchModel.js

Index: third_party/WebKit/Source/devtools/front_end/emulation/TouchModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/emulation/TouchModel.js b/third_party/WebKit/Source/devtools/front_end/emulation/TouchModel.js
deleted file mode 100644
index 883ccf642fe3f473091f55078165b7925ed87486..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/devtools/front_end/emulation/TouchModel.js
+++ /dev/null
@@ -1,141 +0,0 @@
-// Copyright 2016 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
- */
-Emulation.MultitargetTouchModel = class {
-  constructor() {
-    this._touchEnabled = false;
-    this._touchMobile = false;
-    this._customTouchEnabled = false;
-
-    SDK.targetManager.observeTargets(this, SDK.Target.Capability.TouchEmulation);
-  }
-
-  /**
-   * @return {!Emulation.MultitargetTouchModel}
-   */
-  static instance() {
-    if (!Emulation.MultitargetTouchModel._instance)
-      Emulation.MultitargetTouchModel._instance = new Emulation.MultitargetTouchModel();
-    return /** @type {!Emulation.MultitargetTouchModel} */ (Emulation.MultitargetTouchModel._instance);
-  }
-
-  /**
-   * @param {boolean} enabled
-   * @param {boolean} mobile
-   */
-  setTouchEnabled(enabled, mobile) {
-    this._touchEnabled = enabled;
-    this._touchMobile = mobile;
-    this._updateAllTargets();
-  }
-
-  /**
-   * @param {boolean} enabled
-   */
-  setCustomTouchEnabled(enabled) {
-    this._customTouchEnabled = enabled;
-    this._updateAllTargets();
-  }
-
-  _updateAllTargets() {
-    for (var target of SDK.targetManager.targets(SDK.Target.Capability.TouchEmulation))
-      this._applyToTarget(target);
-  }
-
-  /**
-   * @param {!SDK.Target} target
-   */
-  _applyToTarget(target) {
-    var current = {enabled: this._touchEnabled, configuration: this._touchMobile ? 'mobile' : 'desktop'};
-    if (this._customTouchEnabled)
-      current = {enabled: true, configuration: 'mobile'};
-
-    var overlayModel = target.model(SDK.OverlayModel);
-    var inspectModeEnabled = overlayModel ? overlayModel.inspectModeEnabled() : false;
-    if (inspectModeEnabled)
-      current = {enabled: false, configuration: 'mobile'};
-
-    /**
-     * @suppressGlobalPropertiesCheck
-     */
-    const injectedFunction = function() {
-      const touchEvents = ['ontouchstart', 'ontouchend', 'ontouchmove', 'ontouchcancel'];
-      var recepients = [window.__proto__, document.__proto__];
-      for (var i = 0; i < touchEvents.length; ++i) {
-        for (var j = 0; j < recepients.length; ++j) {
-          if (!(touchEvents[i] in recepients[j])) {
-            Object.defineProperty(
-                recepients[j], touchEvents[i], {value: null, writable: true, configurable: true, enumerable: true});
-          }
-        }
-      }
-    };
-
-    var symbol = Emulation.MultitargetTouchModel._symbol;
-    var previous = target[symbol] || {enabled: false, configuration: 'mobile', scriptId: ''};
-
-    if (previous.enabled === current.enabled && (!current.enabled || previous.configuration === current.configuration))
-      return;
-
-    if (previous.scriptId) {
-      target.pageAgent().removeScriptToEvaluateOnLoad(previous.scriptId);
-      target[symbol].scriptId = '';
-    }
-
-    target[symbol] = current;
-    target[symbol].scriptId = '';
-
-    if (current.enabled)
-      target.pageAgent().addScriptToEvaluateOnLoad('(' + injectedFunction.toString() + ')()', scriptAddedCallback);
-
-    /**
-     * @param {?Protocol.Error} error
-     * @param {string} scriptId
-     */
-    function scriptAddedCallback(error, scriptId) {
-      (target[symbol] || {}).scriptId = error ? '' : scriptId;
-    }
-
-    target.emulationAgent().setTouchEmulationEnabled(current.enabled, current.configuration);
-  }
-
-  /**
-   * @param {!Common.Event} event
-   */
-  _inspectModeToggled(event) {
-    var overlayModel = /** @type {!SDK.OverlayModel} */ (event.data);
-    this._applyToTarget(overlayModel.target());
-  }
-
-  /**
-   * @override
-   * @param {!SDK.Target} target
-   */
-  targetAdded(target) {
-    var overlayModel = target.model(SDK.OverlayModel);
-    if (overlayModel)
-      overlayModel.addEventListener(SDK.OverlayModel.Events.InspectModeWillBeToggled, this._inspectModeToggled, this);
-    this._applyToTarget(target);
-  }
-
-  /**
-   * @override
-   * @param {!SDK.Target} target
-   */
-  targetRemoved(target) {
-    var overlayModel = target.model(SDK.OverlayModel);
-    if (overlayModel) {
-      overlayModel.removeEventListener(
-          SDK.OverlayModel.Events.InspectModeWillBeToggled, this._inspectModeToggled, this);
-    }
-  }
-};
-
-Emulation.MultitargetTouchModel._symbol = Symbol('MultitargetTouchModel.symbol');
-
-/** @type {?Emulation.MultitargetTouchModel} */
-Emulation.MultitargetTouchModel._instance = null;