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Reland of [WebAPKs] Make WebAPK update flow more sensible (patchset #2 id:90001 of https://codereview.chromium.org/2845943006/ )

Reason for revert:
Reverting the revert now that https://chrome-internal-review.googlesource.com/c/363648/ has landed. That CL should prevent official builder from breaking

Original issue's description:
> Revert of [WebAPKs] Make WebAPK update flow more sensible (patchset #4 id:100001 of https://codereview.chromium.org/2827233006/ )
>
> Reason for revert:
> broke official-* bots, see crbug.com/716330
>
> Original issue's description:
> > [WebAPKs] Make WebAPK update flow more sensible
> >
> > Previously, whenever the shell_apk in shell_apk_version.gni there was a period
> > of time during which
> > - Chrome tries to update the WebAPK because the "shell_apk" version with which
> >   Chrome is compiled with was updated
> > - The WebAPK server is unable to fulfill the update request because the new
> >   ShellAPK has not yet been uploaded to the WebAPK server
> >
> > This CL splits shell_apk_version in shell_apk_version.gni into two variables:
> > |template_shell_apk_version| and |expected_shell_apk_version|
> >
> > The new flow for updating android/webapk/shell_apk will be:
> > 1) Write CL which:
> >    - Makes changes to code in android/webapk/shell_apk
> >    - Increments |template_shell_apk_version|
> >    This will:
> >    - Update the template ShellAPK which is built on the official build bot
> >    - Trigger an alert that the ShellAPK on the WebAPK Minting Server needs to
> >      be updated
> >    - Does not affect the "WebAPK update logic".
> > 2) Upload new ShellAPK template to the WebAPK Minting Server
> >    At this point:
> >    - new WebAPK installs will have the updated shell.
> >    - Chrome will still not request updates to the new ShellAPK version
> > 3) Write CL which:
> >    - Increments |expected_shell_apk_version|
> >    This will:
> >    - cause Chrome to request updates to the new ShellAPK version
> >
> > BUG=708053
> >
> > Review-Url: https://codereview.chromium.org/2827233006
> > Cr-Commit-Position: refs/heads/master@{#467708}
> > Committed: https://chromium.googlesource.com/chromium/src/+/d71abed75b07b4b9fc50591cbeb2b6c8874bf448
>
> TBR=hartmanng@chromium.org,hanxi@chromium.org,zpeng@chromium.org,dominickn@chromium.org,pkotwicz@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=708053
>
> Review-Url: https://codereview.chromium.org/2845943006
> Cr-Commit-Position: refs/heads/master@{#467966}
> Committed: https://chromium.googlesource.com/chromium/src/+/db08d35eab5d639a6ed751dd4e42dcd5b4f683ec

TBR=hartmanng@chromium.org,hanxi@chromium.org,zpeng@chromium.org,dominickn@chromium.org,timvolodine@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=708053

Review-Url: https://codereview.chromium.org/2847263002
Cr-Commit-Position: refs/heads/master@{#468075}