Work around offline integration test failure

This adds a workaround for a Chrome bug so that the test can be
unquarantined.

Change-Id: I3b076af346db008f3b59e7897c79e78f29fc72df

test/offline/offline_integration.js

@@ -86,13 +86,7 @@ describe('Offline', /** @suppress {accessControls} */ function() {
   });
 
   // TODO: Add a PlayReady version once Edge supports offline.
-  // TODO: Still failing in Chrome canary 73 on 2018-12-12.
-  // Some combination of these bugs is preventing this test from working:
-  //   http://crbug.com/690583
-  //   http://crbug.com/887535
-  //   http://crbug.com/887635
-  //   http://crbug.com/883895
-  quarantinedIt(
+  drmIt(
       'stores, plays, and deletes protected content with a persistent license',
       async function() {
         if (!supportsStorage()) {
@@ -113,6 +107,13 @@ describe('Offline', /** @suppress {accessControls} */ function() {
         storage.configure({usePersistentLicense: true});
         let content = await storage.store('test:sintel-enc');
 
+        // Work around http://crbug.com/887535 in which load cannot happen right
+        // after close.  Experimentally, we seem to need a ~1s delay, so we're
+        // using a 3s delay to ensure it doesn't flake.  Without this, we get
+        // error 6005 (FAILED_TO_CREATE_SESSION) with system code 70.
+        // TODO: Remove when Chrome is fixed
+        await shaka.test.Util.delay(3);
+
         let contentUri = content.offlineUri;
         goog.asserts.assert(
             contentUri, 'Stored content should have an offline uri.');