Devtools UI: Fix recording shortcut on Mac to use Cmd not Ctrl

Source/devtools/front_end/timeline/module.json

 {
     "extensions": [
         {
             "type": "@WebInspector.PanelFactory",
             "name": "timeline",
             "title": "Timeline",
             "order": 3,
             "className": "WebInspector.TimelinePanelFactory"
         },
         {
@@ skipping 10 matching lines @@
             "className": "WebInspector.LoadTimelineHandler"
         },
         {
             "type": "@WebInspector.ActionDelegate",
             "actionId": "timeline.toggle-recording",
             "iconClass": "record-toolbar-item",
             "contextTypes": ["WebInspector.TimelinePanel"],
             "className": "WebInspector.TimelinePanel.RecordActionDelegate",
             "bindings": [
                 {
+                    "platform": "windows,linux",
                     "shortcut": "Ctrl+E"
+                },
+                {
+                    "platform": "mac",
+                    "shortcut": "Meta+E"
                 }
             ]
         }
     ],
     "dependencies": [
         "components",
         "components_lazy",
         "ui_lazy"
     ],
     "scripts": [
@@ skipping 18 matching lines @@
         "TransformController.js",
         "PaintProfilerView.js",
         "TimelinePanel.js"
     ],
     "resources": [
         "invalidationsTree.css",
         "timelinePanel.css",
         "timelineStatusDialog.css"
     ]
 }