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The two tests (SelectionInsideScreen, HighlighterGesturesScaled)
were disabled because they stopped working in Mash).

SelectionInsideScreen is now passing reliably after Mash removal.

HighlighterGesturesScaled required some changes to accommodate
the new contract of highlighter selection callback (it is now
passing a rectangle in dip instead of px).

Bug: 917113
Test: automated
Change-Id: I43a2dd9a28ce0efc2748cf208e9c04c470d89026
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1695657Reviewed-by: Vladislav Kaznacheev <kaznacheev@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: Vladislav Kaznacheev <kaznacheev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676120}