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[remoting host][linux] Add a watchdog for the IgnoreXServerGrabs
Per crbug.com/1130090, it appears that it's the call to IgnoreXServerGrabs() that has been blocking the network thread on the prober VMs. This CL adds a watchdog that monitors the time it takes to call IgnoreXServerGrabs() and crashes the host if it takes too long. This doesn't fix the underlying problem of IgnoreXServerGrabs() being blocky, but should be sufficient to calm down the probers, and prove/disprove the hypothesis. Bug: 1130090 Change-Id: I63954b4cdf72a2015344a4900d3e1ce6f9e5ae81 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2725026 Commit-Queue: Yuwei Huang <yuweih@chromium.org> Reviewed-by: Lambros Lambrou <lambroslambrou@chromium.org> Cr-Commit-Position: refs/heads/master@{#858376}
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