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At present TouchSelectionController uses |show_touch_handles_| to decide
when handles are shown by touch events. It is set to 'true' in
TouchSelectionController::WillHandleTouchEventImpl(). But if this value
is defaulted to true, then PDFs may show the handles on the first
selection, even if initiated by non-touch means. This doesn't show up
in non-PDF pages, as there seems to be a mechanism in
RenderWidgetHostViewAura that prevents the TouchSelectionController from
ever being told about selection changes from non-Touch events.

Some tests were fixed, since they relied on the old default value to
avoid having to send actual touch events.

The CL changes the default to avoid handles showing up for the first
mouse selection in PDFs.

Bug: 933631
Change-Id: I1d66df070c22481141f68f6085f04878842c9f2b
Reviewed-on: https://chromium-review.googlesource.com/c/1491794
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Mohsen Izadi <mohsen@chromium.org>
Reviewed-by: AJITH KUMAR V <ajith.v@samsung.com>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636809}