Add zooming commands to menu (default app)

default_app/main.js

@@ -99,6 +99,40 @@ app.once('ready', () => {
           click (item, focusedWindow) {
             if (focusedWindow) focusedWindow.toggleDevTools()
           }
+        },
+        {
+          type: 'separator'
+        },
+        {
+          label: 'Actual Size',
+          accelerator: 'CmdOrCtrl+0',
+          click (item, focusedWindow) {
+            if (focusedWindow) focusedWindow.webContents.setZoomLevel(0)
+          }
+        },
+        {
+          label: 'Zoom In',
+          accelerator: 'CmdOrCtrl+Plus',
+          click (item, focusedWindow) {
+            if (focusedWindow) {
+              const {webContents} = focusedWindow
+              webContents.getZoomLevel((zoomLevel) => {
+                webContents.setZoomLevel(zoomLevel + 0.5)
+              })
+            }
+          }
+        },
+        {
+          label: 'Zoom Out',
+          accelerator: 'CmdOrCtrl+-',
+          click (item, focusedWindow) {
+            if (focusedWindow) {
+              const {webContents} = focusedWindow
+              webContents.getZoomLevel((zoomLevel) => {
+                webContents.setZoomLevel(zoomLevel - 0.5)
+              })
+            }
+          }
         }
       ]
     },