d488661c95cd538b90a279c7c998363eb4eb84a8

This change implements step 2 of the process outlined in //docs/flag_expiry.md. This change will be merged to the M77 branch after it lands so that these flags are actually expired in M77 :) This change: 1) Adds a new bit to the supported_platforms mask in flag entries, named 'kExpireM77', which is set if a flag expired in M77; 2) Adds a new feature "TemporaryUnexpireFlagsM77" and a matching flag "temporary-unexpire-flags-m77"; 3) Adds code to the flags UI to hide flags with kExpireM77 in their supported_platforms mask unless TemporaryUnexpireFlagsM77 is enabled. 4) Removes already-gone flags from //c/b/flag-metadata.json 5) Removes already-gone flags from //docs/flag_expiry.md Future iterations of this process will use two more bits in the supported_platforms mask, since the flag expiry process maintains a window of two milestones between flag expiration and final removal, so (e.g.) at M78 kExpireM77 and kExpireM78 will be live, and at M79 kExpireM77 will be removed and kExpireM79 added, such that kExpireM78 and kExpireM79 will be live. After this change, all the flags annotated with kExpireM77 show as "unsupported platform" in the flags UI and are greyed out. A follow-up change will add a specific annotation to these flags in that UI marking them as expired. Bug: 953690 Change-Id: I2d7361b6f3f070ecf469bf4eccb9b42b5a19d704 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1729449 Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org> Reviewed-by: Nico Weber <thakis@chromium.org> Cr-Commit-Position: refs/heads/master@{#682945}
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Chromium
Chromium is an open-source browser project that aims to build a safer, faster, and more stable way for all users to experience the web.
The project's web site is https://www.chromium.org.
Documentation in the source is rooted in docs/README.md.
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Chromium是一个开源浏览器项目,提供了一种安全、快速、稳定的方法来体验Web。该浏览器可以在多个平台上下载,包括Mac、Windows、Linux和ChromiumOS。项目原始地址: https://chromium.googlesource.com/chromium/src.git
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