We need to track window compositor state in various cases, when compositor is paused after window creation,
when compositor is paused for hidden window (EGLSurface is missing) and paused compositor when layout is not updated yet
and drawing will lead to incorrect / obsoleted window content.
In this patch we track compositor state by WindowCompositorState atomic enum (because it can be accessed from Compositor thread)
and two private methods (PauseCompositorHiddenWindow and ResumeCompositorHiddenWindow) and two public ones (PauseCompositor() and ResumeCompositor).
Private interface is used by nsWindow when EGLSurface is missing so we can't render to window - it's initial compositor pause and
pause when window is hidden.
Public interface is used by nsWindow and WebRender compositor to disable/enable rendering when window content is updated.
When compositor is disabled by public interface it will be enabled automatically after a timeout (1s) or when content layout is updated.
Changes in the patch:
- Implement GtkCompositorWidget::RemoteLayoutSizeUpdated() to notify GtkCompositorWidget widget about layout size update in content process.
- Track nsWindow compositor state by WindowCompositorState
- Implement nsWindow::PauseCompositorHiddenWindow() and ResumeCompositorHiddenWindow() to handle internal nsWindow states.
- Implement nsWindow::PauseCompositor() and nsWindow::ResumeCompositor() to allow compositor pause/resume during content layout updates.
- Use timeout to resume compositor paused by public interface as a fallback when content is not updated or it takes too long.
Differential Revision: https://phabricator.services.mozilla.com/D121650
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