[D159546](https://phabricator.services.mozilla.com/D159546) adds a wpt to check the `VideoFrame` cannot be posted across processes. Surprisingly, the test results in try server show that the WPT pages in different origins are actually in the same process on webrender-enabled Linux and Android machines. IIUC, [fission](https://wiki.mozilla.org/Project_Fission) should isolate the pages into the processes dedicated to their origins.
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[D159546](https://phabricator.services.mozilla.com/D159546) adds a wpt to check the `VideoFrame` cannot be posted across processes. Surprisingly, the [test results in try server](https://treeherder.mozilla.org/jobs?repo=try&revision=a79cca2d2a75914166164811671fdd562550a448&selectedTaskRun=F8mvStGcShu6XeOV4PrFdg.0) show that the WPT pages in different origins are actually in the same process on webrender-enabled Linux and Android machines. IIUC, [fission](https://wiki.mozilla.org/Project_Fission) should isolate the pages into the processes dedicated to their origins.