Make the flash permission prompt work properly on file: URLs

chrome/test/data/permissions/flash.js

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function triggerPrompt() {
+  document.getElementById('flash-link').click();
+  window.domAutomationController.send(true);
+}
+
+function triggerPromptViaNewWindow() {
+  document.getElementById('flash-new-window-link').click();
+  window.domAutomationController.send(true);
+}
+
+function flashIsEnabledForPlugin(plugin) {
+  plugin.addEventListener('message', function handleEvent(event) {
+   if (event.data.source === 'getPowerSaverStatusResponse') {
+      plugin.removeEventListener('message', handleEvent);
+      window.domAutomationController.send(true);
+    }
+  });
+  if (plugin.postMessage)
+    plugin.postMessage('getPowerSaverStatus');
+  else
+    window.domAutomationController.send(false);
+}
+
+function flashIsEnabled() {
+  flashIsEnabledForPlugin(document.getElementById('flash-object'));
+}
+
+function flashIsEnabledForPluginWithoutFallback() {
+  flashIsEnabledForPlugin(
+      document.getElementById('flash-object-no-fallback'));
+}