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Runs only on iOS 13+, and will:
- Select a word on a test page,
- Tap on "Link to Text",
- Tap on the "Copy" activity,
- Assert that the expected URL was added to the pasteboard.

Test is skipped on iOS 12 due to the activity view not being accessible
by EarlGrey.

Test is disabled on iPads due to:
Bug: 1149603

Change-Id: Ia1011f538e6d2b6aed00a12cccd19df40da13472
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2530389
Commit-Queue: Sebastien Lalancette <seblalancette@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: sebsg <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828195}