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The current test case examines the smoothness for the transition
of half-visible search to fullscreen search. The new one does
the test of fullscreen app-list to fullscreen search. I think
this would verify the animation smoothness within the app-list
itself very clearly.

With r676512, the performance numbers (on nocturne) are:
LauncherAnimations/LauncherAnimationsFullscreenSearchTest.SearchAfterFullscreen/0:
  Apps.AppListHide.InputLatency:
    64, 64, 64, 64, 64
  Apps.StateTransition.AnimationSmoothness.Close.ClamshellMode:
    93, 86, 86, 86, 86
  Apps.StateTransition.AnimationSmoothness.FullscreenSearch.ClamshellMode:
    39, 33, 33, 33, 26
LauncherAnimations/LauncherAnimationsFullscreenSearchTest.SearchAfterFullscreen/1:
  Apps.AppListHide.InputLatency:
    63, 55, 64, 63, 64
  Apps.StateTransition.AnimationSmoothness.Close.ClamshellMode:
    93, 93, 93, 100, 93
  Apps.StateTransition.AnimationSmoothness.FullscreenSearch.ClamshellMode:
    66, 59, 73, 73, 66

Bug: 961467
Test: runs on nocturne
Change-Id: I0246c63db1a327b55a1ee8f0540609613a9c0a40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1699211Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#677063}