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EventGenerator::PressTouch would set |is_touch_down_| of aura::Env to
be true. And aura::Env is singleton and shared by test cases. So in CL,
AshTestBase::SetUp is modified to reset aura::Env's properties.

Bug: 586514
Change-Id: Iea96d7fcfc2fba1db857e0d8fe7a1931300cf0cd
Reviewed-on: https://chromium-review.googlesource.com/c/1293174Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604745}