Devtools: Add screenshot button to device mode toolbar.

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

 // 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.
 
 /**
  * @extends {WebInspector.VBox}
  * @param {!WebInspector.InspectedPagePlaceholder} inspectedPagePlaceholder
  * @constructor
  */
 WebInspector.DeviceModeWrapper = function(inspectedPagePlaceholder)
@@ skipping 12 matching lines @@
 /** @type {!WebInspector.DeviceModeWrapper} */
 WebInspector.DeviceModeView._wrapperInstance;
 
 WebInspector.DeviceModeWrapper.prototype = {
     _toggleDeviceMode: function()
     {
         this._showDeviceModeSetting.set(!this._showDeviceModeSetting.get());
     },
 
     /**
+     * @return {boolean}
+     */
+    _captureScreenshot: function()
+    {
+        if (!this._deviceModeView)
+            return false;
+        this._deviceModeView.captureScreenshot();
+        return true;
+    },
+
+    /**
      * @param {boolean} force
      */
     _update: function(force)
     {
         this._toggleDeviceModeAction.setToggled(this._showDeviceModeSetting.get());
         if (!force) {
             var showing = this._deviceModeView && this._deviceModeView.isShowing();
             if (this._showDeviceModeSetting.get() === showing)
                 return;
         }
@@ skipping 30 matching lines @@
      * @param {string} actionId
      * @return {boolean}
      */
     handleAction: function(context, actionId)
     {
         if (WebInspector.DeviceModeView._wrapperInstance) {
             if (actionId === "emulation.toggle-device-mode") {
                 WebInspector.DeviceModeView._wrapperInstance._toggleDeviceMode();
                 return true;
             }
+            if (actionId === "emulation.capture-screenshot")
+                return WebInspector.DeviceModeView._wrapperInstance._captureScreenshot();
         }
         return false;
     }
 }