[FspCache] Introduce CloudFileInfo and versionTag to various methods This introduces a new dictionary that contains information specifically relevant to files that are backed by a cloud file system. The info in this dictionary will be used by an upcoming project that introduces content caching capability to the chrome.fileSystemProvider API. Context: http://go/version-tag-to-fsp Fixed: b/328536017 Bug: b/328536062 Change-Id: I2171521cf7775c52e5ee2821883102bed63c23ee Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5343674 Auto-Submit: Ben Reich <[email protected]> Reviewed-by: Devlin Cronin <[email protected]> Commit-Queue: Justin Lulejian <[email protected]> Reviewed-by: Alexander Bolodurin <[email protected]> Reviewed-by: Justin Lulejian <[email protected]> Reviewed-by: Erik Chen <[email protected]> Cr-Commit-Position: refs/heads/main@{#1277812} NOKEYCHECK=True GitOrigin-RevId: 15ebd7f7b345ef2563674fc27b9ea9a72e478374