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When Steady State Elisions is on, when the user clicks the mouse once,
it should focus and select all in the text field.

When the user places the caret inside the text by clicking on the text
a second time, it should unelide on mouseup only.

This adds a test for that. It also places the View inside a Widget to
make the focus behave correctly.

It also adds a fake clock to the Steady State Elisions test, so we
can control the click being not interpreted as a double-click.

Bug: 797354
Change-Id: If72235dd88b6918f9071fffea800723a24c555f7
Reviewed-on: https://chromium-review.googlesource.com/1007492
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550449}