[DevTools] More UX fixes in Device Mode.

third_party/WebKit/Source/devtools/front_end/emulation/module.json

 {
     "extensions": [
         {
             "type": "@WebInspector.AppProvider",
             "condition": "can_dock",
             "className": "WebInspector.AdvancedAppProvider",
             "order": 0
         },
         {
             "type": "@WebInspector.ActionDelegate",
@@ skipping 10 matching lines @@
                 },
                 {
                     "platform": "mac",
                     "shortcut": "Shift+Meta+M"
                 }
             ]
         },
         {
             "type": "@WebInspector.ActionDelegate",
             "actionId": "emulation.capture-screenshot",
+            "category": "Mobile",
             "className": "WebInspector.DeviceModeWrapper.ActionDelegate",
-            "title": "Capture screenshot"
+            "title": "Capture screenshot",
+            "tags": "device"
         },
         {
             "type": "context-menu-item",
             "location": "deviceModeMenu/tools",
             "order": 12,
             "actionId": "emulation.capture-screenshot"
         },
         {
             "type": "@WebInspector.ToolbarItem.Provider",
             "actionId": "emulation.toggle-device-mode",
@@ skipping 19 matching lines @@
             "settingName": "emulation.showRulers",
             "settingType": "boolean",
             "defaultValue": false,
             "options": [
                 {"value": true, "title": "Show rulers"},
                 {"value": false, "title": "Hide rulers"}
             ],
             "tags": "device"
         },
         {
+            "type": "setting",
+            "category": "Mobile",
+            "settingName": "emulation.showDeviceOutline",
+            "settingType": "boolean",
+            "defaultValue": false,
+            "options": [
+                {"value": true, "title": "Show device frame"},
+                {"value": false, "title": "Hide device frame"}
+            ],
+            "tags": "device"
+        },
+        {
             "type": "settings-view",
             "name": "devices",
             "title": "Devices",
             "order": "30",
             "className": "WebInspector.DevicesSettingsTab",
             "settings": [
                 "standardEmulatedDeviceList",
                 "customEmulatedDeviceList"
             ]
         },
@@ skipping 47 matching lines @@
         "DeviceModeWrapper.js"
     ],
     "resources": [
         "devicesSettingsTab.css",
         "deviceModeToolbar.css",
         "deviceModeView.css",
         "mediaQueryInspector.css",
         "sensors.css"
     ]
 }