FilePathWatcher: Implement inotify usage callback Implements the inotify FilePathWatcher's usage callback logic to call it anytime usage changes. Creates the UsageMonitor class which tries to provide guarantees that all usage changes are reported and reported only once. Bug: 338457523 Change-Id: Ife96824ac9a13b6e7a3f8a2ba950243404fcbd03 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5972769 Reviewed-by: Daseul Lee <dslee@chromium.org> Commit-Queue: Nathan Memmott <memmott@chromium.org> Cr-Commit-Position: refs/heads/main@{#1376932}
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