[HTML5] Fix target_fps when window loses focus. #48543
Merged
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We don't get updates when the window is unfocused/minimized, so we must detect the situation where the counted ticks start drifting away resulting in more frames drawn than needed.
This commit adds a check to ensure that the target ticks do not drift away more than one second.
Fixes #48061
(the first commit is the usual
RasterizerDummy
fix, the second commit should be cherry-pickable).