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Update PNaCl deprecation doc for gonacl/chrome devsite

This mirrors the announcement that was sent to native-client-discuss.

Bug: 918374
Change-Id: I2e82c60533a2215bdc08ab6668031cba8e94498d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1750204
Reviewed-by: Sam Clegg <sbc@chromium.org>
Commit-Queue: Derek Schuff <dschuff@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686616}
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dschuff authored and Commit Bot committed Aug 13, 2019
1 parent fce2a2d commit e82443a8748ab87dbe68007b9b78443f2a100d2a
@@ -5,10 +5,21 @@
<h2 id="p-nacl-deprecation-announcements">(P)NaCl Deprecation Announcements</h2>
<p>Given the momentum of cross-browser WebAssembly support, we plan to focus our
native code efforts on WebAssembly going forward and plan to remove support for
PNaCl in Q2 2019 (except for Chrome Apps). We believe that the vibrant
PNaCl in Q4 2019 (except for Chrome Apps). We believe that the vibrant
ecosystem around <a class="reference external" href="http://webassembly.org">WebAssembly</a>
makes it a better fit for new and existing high-performance
web apps and that usage of PNaCl is sufficiently low to warrant deprecation.</p>
<p>As of Chrome 76, PNaCl on the open web has been moved behind an
<a class="reference external" href="https://github.com/GoogleChrome/OriginTrials/blob/gh-pages/developer-guide.md">Origin Trial</a>
which is a mechanism for web developers to register and get access to a feature that isn&#8217;t on by default.
This is usually a new proposed feature but in this case it&#8217;s a feature being deprecated.
A developer can register on the <a class="reference external" href="https://developers.chrome.com/origintrials/#/view_trial/3553340105995321345">Origin Trial Console</a>
and receive a token, which can be embedded into a page and will enable the feature without the user needing to use a flag.
(For more details see the linked guide). The trial is scheduled to last through Chrome 78, approximately until December 2019.
This change is not intended to affect NaCl or PNaCl in Chrome Apps or extensions, and the "enable-nacl"
flag in chrome://flags can also be used to enable PNaCl locally for testing
(this flag also retains its current function of enabling non-PNaCl "native" NaCl on any page).
</p>
<p>We also recently announced the deprecation Q1 2018 of
<a class="reference external" href="https://blog.chromium.org/2016/08/from-chrome-apps-to-web.html">Chrome Apps</a>
outside of ChromeOS.</p>
@@ -8,11 +8,24 @@ WebAssembly Migration Guide

Given the momentum of cross-browser WebAssembly support, we plan to focus our
native code efforts on WebAssembly going forward and plan to remove support for
PNaCl in Q2 2019 (except for Chrome Apps). We believe that the vibrant
PNaCl in Q4 2019 (except for Chrome Apps). We believe that the vibrant
ecosystem around `WebAssembly <http://webassembly.org>`_
makes it a better fit for new and existing high-performance
web apps and that usage of PNaCl is sufficiently low to warrant deprecation.

As of Chrome 76, PNaCl on the open web has been moved behind an
`Origin Trial
<https://github.com/GoogleChrome/OriginTrials/blob/gh-pages/developer-guide.md>`_,
which is a mechanism for web developers to register and get access to a feature that isn't on by default.
This is usually a new proposed feature but in this case it's a feature being deprecated.
A developer can register on the `Origin Trial Console
<https://developers.chrome.com/origintrials/#/view_trial/3553340105995321345>`_
and receive a token, which can be embedded into a page and will enable the feature without the user needing to use a flag.
(For more details see the linked guide). The trial is scheduled to last through Chrome 78, approximately until December 2019.
This change is not intended to affect NaCl or PNaCl in Chrome Apps or extensions, and the "enable-nacl"
flag in chrome://flags can also be used to enable PNaCl locally for testing
(this flag also retains its current function of enabling non-PNaCl "native" NaCl on any page).

We also recently announced the deprecation Q1 2018 of
`Chrome Apps
<https://blog.chromium.org/2016/08/from-chrome-apps-to-web.html>`_

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