[GPUP] Use MonotonicTime for elapsed time

[Eric Carlson]

MediaPlayerPrivateRemote and RemoteMediaPlayerProxy should use MonotonicTime instead of WallTime

[Radar WebKit Bug Importer]

<rdar://problem/77472811>

[Eric Carlson]

Created attachment 427604 [details]
Patch

[Simon Fraser (smfr)]

Comment on attachment 427604 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=427604&action=review

> Source/WebKit/GPUProcess/media/RemoteMediaPlayerProxy.cpp:976
> -    auto transmissionTime = MediaTime::createWithDouble((WallTime::now() - messageTime).value(), 1);
> +    auto transmissionTime = MediaTime::createWithDouble((MonotonicTime::now() - messageTime).value(), 1);
>      auto adjustedTaskTime = taskTime - transmissionTime;
>      auto currentTime = m_player->currentTime();
>      if (adjustedTaskTime <= currentTime) {
> -        completionHandler(currentTime, WallTime::now());
> +        completionHandler(currentTime, MonotonicTime::now());

I hate seeing code that fetches current time more than once in the same function (time will have advanced slightly, plus it has cost). So compute 'now' just once.

> Source/WebKit/WebProcess/GPU/media/RemoteMediaPlayerState.h:40
> +    MonotonicTime monotonicTime;

The name of the member says what it is, but not what it does.

[Eric Carlson]

Created attachment 427612 [details]
Patch for landing

[EWS]

Committed r276973 (237302@main): <https://commits.webkit.org/237302@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 427612 [details].