chore: simplify main world setup of contextIsolation (#16046)

lib/renderer/init.js

@@ -33,6 +33,7 @@ require('@electron/internal/renderer/web-frame-init')()
 // Process command line arguments.
 let nodeIntegration = false
 let webviewTag = false
+let contextIsolation = false
 let preloadScript = null
 let preloadScripts = []
 let isBackgroundPage = false
@@ -56,6 +57,8 @@ for (const arg of process.argv) {
     appPath = arg.substr(arg.indexOf('=') + 1)
   } else if (arg.indexOf('--webview-tag=') === 0) {
     webviewTag = arg.substr(arg.indexOf('=') + 1) === 'true'
+  } else if (arg === '--context-isolation') {
+    contextIsolation = true
   } else if (arg.indexOf('--preload-scripts') === 0) {
     preloadScripts = arg.substr(arg.indexOf('=') + 1).split(path.delimiter)
   }
@@ -69,6 +72,12 @@ if (preloadScript) {
   preloadScripts.push(preloadScript)
 }
 
+// Pass the arguments to isolatedWorld.
+if (contextIsolation) {
+  const isolatedWorldArgs = { ipcRenderer, guestInstanceId, hiddenPage, openerId, usesNativeWindowOpen }
+  v8Util.setHiddenValue(global, 'isolated-world-args', isolatedWorldArgs)
+}
+
 if (window.location.protocol === 'chrome-devtools:') {
   // Override some inspector APIs.
   require('@electron/internal/renderer/inspector')