Narrow the instrumentation to track jank in HostResolverImpl.
I am fairly confident this is coming from IsGloballyReachable(), which seems to have a dependency on UDP sockets, so focused the instrumentation there.
One weakness of this instrumentation is it doesn't separate out some of the non-trivial work being done by local variable's destructors (most notably deletion of the UDP sockets, which will likely be hitting issue 165382).
BUG=455942
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Review URL: https://codereview.chromium.org/1120733002
Cr-Commit-Position: refs/heads/master@{#327831}
1 file changed
