Reland of DevTools: automatically populate 'More tools' submenu with the drawer views.

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 82 matching lines @@
                 "customEmulatedDeviceList"
             ]
         },
         {
             "type": "@WebInspector.ActionDelegate",
             "actionId": "emulation.show-sensors",
             "title": "Sensors",
             "className": "WebInspector.SensorsView.ShowActionDelegate"
         },
         {
-            "type": "context-menu-item",
-            "location": "mainMenu/tools/open",
-            "order": 100,
-            "actionId": "emulation.show-sensors"
-        },
-        {
             "type": "drawer-view",
             "name": "sensors",
             "title": "Sensors",
             "persistence": "closeable",
             "order": 100,
             "className": "WebInspector.SensorsView",
             "tags": "geolocation, accelerometer, device orientation"
         }
     ],
     "dependencies": [
@@ skipping 18 matching lines @@
         "DeviceModeWrapper.js"
     ],
     "resources": [
         "devicesSettingsTab.css",
         "deviceModeToolbar.css",
         "deviceModeView.css",
         "mediaQueryInspector.css",
         "sensors.css"
     ]
 }