Check context status before creating new platform destination

RealtimeAudioDestinationHandler::SetSinkDescriptor creates new
destination platofrm without validating context status. This can
reactivate the audio rendering thread when AudioContext is already in
closed state.

(cherry picked from commit 0f9bb9a)

Bug: 1500856
Change-Id: If1fd531324b56fcdc38d315fd84d4cec577a14bc
Test: Locally confirmed with ASAN
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5021160
Reviewed-by: Alvin Ji <alvinji@chromium.org>
Commit-Queue: Alvin Ji <alvinji@chromium.org>
Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1223168}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5038792
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Hongchan Choi <hongchan@chromium.org>
Cr-Commit-Position: refs/branch-heads/6045@{#1382}
Cr-Branched-From: 905e8bd-refs/heads/main@{#1204232}

third_party/blink/renderer/modules/webaudio/realtime_audio_destination_handler.cc

@@ -405,6 +405,17 @@ void RealtimeAudioDestinationHandler::SetSinkDescriptor(
                   GetCallbackBufferSize()));
   DCHECK(IsMainThread());
 
+  // After the context is closed, `SetSinkDescriptor` request will be ignored
+  // because it will trigger the recreation of the platform destination. This in
+  // turn can activate the audio rendering thread.
+  AudioContext* context = static_cast<AudioContext*>(Context());
+  CHECK(context);
+  if (context->ContextState() == AudioContext::kClosed) {
+    std::move(callback).Run(
+        media::OutputDeviceStatus::OUTPUT_DEVICE_STATUS_ERROR_INTERNAL);
+    return;
+  }
+
   // Create a pending AudioDestination to replace the current one.
   scoped_refptr<AudioDestination> pending_platform_destination =
       AudioDestination::Create(