Suppress source map errors

If a test causes an error page, the test will be retried.
DevTools tries to request a source map on the error page,
thus, failing the entire test run due to source map loading errors
even if the test retry was successful.

This CL adds the network resource loading errors related to
source maps to the global allow list.

Bug: none
Change-Id: I5678d9e2d73a8b2a0f916a4351a84a12e537b743
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/5961817
Reviewed-by: Simon Zünd <[email protected]>
Commit-Queue: Alex Rudenko <[email protected]>

Author: OrKoN

test/conductor/events.ts

@@ -36,6 +36,9 @@ const ALLOWED_ASSERTION_FAILURES = [
   'Request Storage.getStorageKeyForFrame failed. {"code":-32602,"message":"Frame tree node for given frame not found"}',
   'Unable to create texture',
   'Not allowed to load local resource: devtools://theme/colors.css',
+  // neterror.js started serving sourcemaps and we're requesting it unnecessarily.
+  'Request Network.loadNetworkResource failed. {"code":-32602,"message":"Unsupported URL scheme"}',
+  'Fetch API cannot load chrome-error://chromewebdata/neterror.rollup.js.map. URL scheme "chrome-error" is not supported.',
 ];
 
 const logLevels = {

test/e2e/layers/layers_test.ts

@@ -4,7 +4,6 @@
 
 import {assert} from 'chai';
 
-import {expectError} from '../../conductor/events.js';
 import {
   getBrowserAndPages,
   getResourcesPath,
@@ -41,10 +40,6 @@ describe('The Layers Panel', () => {
 
   // Flaky test.
   it.skipOnPlatforms(['linux'], '[crbug.com/327062511] should update the layers view when going offline', async () => {
-    // neterror.js started serving sourcemaps and we're requesting it unnecessarily.
-    expectError('Request Network.loadNetworkResource failed. {"code":-32602,"message":"Unsupported URL scheme"}');
-    expectError(
-        'Fetch API cannot load chrome-error://chromewebdata/neterror.rollup.js.map. URL scheme "chrome-error" is not supported.');
     const {target, frontend} = getBrowserAndPages();
     await openPanelViaMoreTools('Layers');