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This CL tests that double-click triggers unelision of steady state
elided URLs with the proper portion selected afterwards. This unelision
occurs on the second mousedown.

It also tests that triple-click triggers unelision and ends with
everything selected.

Bug: 797354
Change-Id: I3174242ad5f188ef0808a859a376bc0393a76faf
Reviewed-on: https://chromium-review.googlesource.com/1008866
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550624}