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This is a reland of 6769a912
This caches the SHARE_BY_DEFAULT_IN_CCT flag, which should prevent JNI not enabled crashes.

Original change's description:
> [ShareCCT] Implement sharing in the toolbar and by default in CCT.
>
> Bug: 1135311
> Change-Id: I967300591d383a21b9f3f40233422b763180ddb0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2459403
> Reviewed-by: Tanya Gupta <tgupta@chromium.org>
> Reviewed-by: Andrew Grieve <agrieve@chromium.org>
> Reviewed-by: Peter Conn <peconn@chromium.org>
> Commit-Queue: Sophey Dong <sophey@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#820029}

Bug: 1135311
Change-Id: I46e7b10e56f092e6fcec5c07b1610dfd71649ca5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2501189Reviewed-by: Peter Conn <peconn@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Tanya Gupta <tgupta@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Sophey Dong <sophey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821864}