updater: document legacy support for the runtime mode
Bug: 1064792 Change-Id: I63e76c8564112b743024ee3fcd2cb6c19d222844 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5238016 Commit-Queue: Sorin Jianu <sorin@chromium.org> Auto-Submit: S Ganesh <ganesh@chromium.org> Commit-Queue: S Ganesh <ganesh@chromium.org> Reviewed-by: Sorin Jianu <sorin@chromium.org> Cr-Commit-Position: refs/heads/main@{#1252272}
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@ -448,6 +448,17 @@ The updater removes the following Omaha registrations:
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registry at `HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run`.
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* Removes the Omaha Core and UA tasks.
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#### Runtime mode (Windows)
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Similar to Omaha, the updater supports command lines of the form:
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`UpdaterSetup.exe /install "runtime=true"`
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`UpdaterSetup.exe /install "runtime=true&needsadmin=false"`
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`UpdaterSetup.exe /install "runtime=true&needsadmin=true"`
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The "runtime" argument in the tag tells the updater to install itself and stay
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on the system without any associated application. The updater will stay on for
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at least `kMaxServerStartsBeforeFirstReg` wakes. This feature is used to expose
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the COM API to a process that will install applications via that API.
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### Installer User Interface
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During installation, the user is presented with a UI that displays the progress
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of the download and installation. The user may close the dialog, which cancels
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