[DevTools] Persist device mode state.

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

 // Copyright 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.
 
 /**
  * @constructor
  * @param {function()} updateCallback
  * @implements {WebInspector.TargetManager.Observer}
  */
 WebInspector.DeviceModeModel = function(updateCallback)
@@ skipping 11 matching lines @@
     // Zero means "fit", positive number is a scale itself.
     this._fitSetting = WebInspector.settings.createSetting("emulation.deviceFit", 0);
     this._fitSetting.addChangeListener(this._fitSettingChanged, this);
     this._widthSetting = WebInspector.settings.createSetting("emulation.deviceWidth", 400);
     this._widthSetting.addChangeListener(this._widthSettingChanged, this);
     this._deviceScaleFactorSetting = WebInspector.settings.createSetting("emulation.deviceScaleFactor", 0);
     this._deviceScaleFactorSetting.addChangeListener(this._deviceScaleFactorSettingChanged, this);
 
     /** @type {!WebInspector.DeviceModeModel.Type} */
     this._type = WebInspector.DeviceModeModel.Type.Desktop;
-    this._fitSetting.set(0);
-    this._deviceScaleFactorSetting.set(0);
     /** @type {?WebInspector.EmulatedDevice} */
     this._device = null;
     /** @type {?WebInspector.EmulatedDevice.Mode} */
     this._mode = null;
     /** @type {boolean} */
     this._touchEnabled = false;
     /** @type {string} */
     this._touchConfiguration = "";
     /** @type {string} */
     this._screenOrientation = "";
@@ skipping 449 matching lines @@
         if (!this._target || orientation === this._screenOrientation)
             return;
 
         this._screenOrientation = orientation;
         if (!this._screenOrientation)
             this._target.screenOrientationAgent().clearScreenOrientationOverride();
         else
             this._target.screenOrientationAgent().setScreenOrientationOverride(this._screenOrientation === "landscapePrimary" ? 90 : 0, /** @type {!ScreenOrientationAgent.OrientationType} */ (this._screenOrientation));
     }
 }