[DevTools] Option to show device frames in emulation mode

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

 {
     "extensions": [
         {
             "type": "emulated-device",
             "device": {
                 "show-by-default": false,
                 "title": "iPhone 4" ,
                 "screen": {
                     "horizontal": {
                         "width": 480,
@@ skipping 278 matching lines @@
                 "type": "phone",
                 "user-agent": "Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.23 Mobile Safari/537.36",
                 "capabilities": [
                     "touch",
                     "mobile"
                 ],
                 "show-by-default": true,
                 "screen": {
                     "device-pixel-ratio": 2.625,
                     "vertical": {
+                        "outline" : {
+                            "image": "@url(nexus_5x_portrait.svg) 1x, @url(nexus_5x_portrait.svg) 2x",
+                            "insets" : { "left": 20, "top": 92, "right": 22, "bottom": 108 }
+                        },
                         "width": 411,
                         "height": 731
                     },
                     "horizontal": {
+                        "outline" : {
+                            "image": "@url(nexus_5x_landscape.svg) 1x, @url(nexus_5x_landscape.svg) 2x",
+                            "insets" : { "left": 94, "top": 23, "right": 100, "bottom": 20 }
+                        },
                         "width": 731,
                         "height": 411
                     }
                 },
                 "modes": [
                     {
                         "title": "default",
                         "orientation": "vertical",
                         "insets": { "left": 0, "top": 24, "right": 0, "bottom": 48 },
                         "image": "@url(google-nexus-5x-vertical-default-1x.png) 1x, @url(google-nexus-5x-vertical-default-2x.png) 2x"
@@ skipping 662 matching lines @@
         }
     ],
     "dependencies": [
         "emulation"
     ],
     "scripts": [
     ],
     "resources": [
     ]
 }