Fix permissions error in RemovesAndAddsAutoclick test

Change-Id: Ie9fc4da6ed9b2b6c2bbcc56ae6de5a088a5760b3
AX-Relnotes: n/a.
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454256
Commit-Queue: Josiah Krutz <josiahk@google.com>
Auto-Submit: Josiah Krutz <josiahk@google.com>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814879}

chrome/browser/resources/chromeos/accessibility/accessibility_common/autoclick/autoclick_test.js

@@ -112,6 +112,13 @@ TEST_F('AutoclickE2ETest', 'RemovesAndAddsAutoclick', function() {
   this.runWithLoadedTree(
       'data:text/html;charset=utf-8,<p>Cats rock!</p>',
       async function(desktop) {
+        // Turn on screen magnifier so that when we turn off autoclick, the
+        // extension doesn't get unloaded and crash the test.
+        await new Promise(resolve => {
+          chrome.accessibilityFeatures.screenMagnifier.set(
+              {value: true}, resolve);
+        });
+
         // Toggle autoclick off and on, ensure it still works and no crashes.
         await new Promise(resolve => {
           chrome.accessibilityFeatures.autoclick.set({value: false}, resolve);

chrome/browser/resources/chromeos/accessibility/accessibility_common_manifest.json.jinja2

@@ -22,6 +22,7 @@
   "permissions": [
     "accessibilityPrivate",
     "accessibilityFeatures.read",
+    "accessibilityFeatures.modify",
     "settingsPrivate"
   ],
   "automation": {