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Adds an "additionalText" optional parameter to the ActivityServices
scenarios, allowing to share a piece of text along with a page's URL
and title. This additional text will be added as an extra activity
item, and will be stored in the pasteboard when users select the Copy
activity.

Bug: 1136043
Change-Id: Ia8d86c4ecfb57bdbc2bac3f209ab37973d79fc59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451309
Commit-Queue: Sebastien Lalancette <seblalancette@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814811}