Bug 1545680 [wpt PR 16368] - Fix flakiness in audioworklet-suspend.https.html, a=testonly

Automatic update from web-platform-tests
Fix flakiness in audioworklet-suspend.https.html

It is because the actual suspension takes time to stop the render loop
completely. So the current time advances a little after the suspension
and the assertion that compares two timestamps fails.

This CL fixes the problem by:
1. Suspend the context immediately after its creation.
2. Cache timestamp A after the worklet module loading is completed.
3. Check timestamp B after 500ms. If the context is not suspended
   (which is the original bug), two timestamps A and B won't match.

Bug: 953332
Test: external/wpt/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-suspend.https.html
Change-Id: I3fc4ccf78ec9c137128f8605d502692be303b02e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1570129
Reviewed-by: Raymond Toy <rtoy@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Hongchan Choi <hongchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#651437}

--

wpt-commits: 3f690a244306cae2276fd1e5f620f5e83096a445
wpt-pr: 16368

testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-suspend.https.html

@@ -14,22 +14,24 @@
       const context = new AudioContext();
       const filePath = 'processors/dummy-processor.js';
 
+      context.suspend();
+
       // Suspends the context right away and then activate worklet. The current
       // time must not advance since the context is suspended.
       audit.define(
           {label: 'load-worklet-and-suspend'},
           async (task, should) => {
-            context.suspend();
-            const suspendTime = context.currentTime;
             await context.audioWorklet.addModule(filePath);
+            const suspendTime = context.currentTime;
             const dummy = new AudioWorkletNode(context, 'dummy');
             dummy.connect(context.destination);
             task.timeout(() => {
-              should(context.currentTime, 'context.currentTime')
-                  .beEqualTo(suspendTime);
+              should(context.currentTime === suspendTime,
+                     'context.currentTime did not change after worklet started')
+                  .beTrue();
               should(context.state, 'context.state').beEqualTo('suspended');
               task.done();
-            }, 1000);
+            }, 500);
           });
 
       audit.run();