Cancel the existing recents animation before any initialization

- In the rare case that we are canceling the recents animation as a
  part of starting another recents animation, ensure that we do it
  before we move the target activity to be visible, otherwise the
  cancelation will undo the previous work.

Bug: 193851085
Test: atest RecentsAnimationControllerTest
Change-Id: I22589a034eab3b1fab10f4b677f777b282305bbd
Merged-In: I22589a034eab3b1fab10f4b677f777b282305bbd
(cherry picked from commit 4ebdbc9db168d38341c131f9c53cf799311b6601)
(cherry picked from commit 7d6151c61ede945a1b29154fd658a425818db049)
1 file changed