Introduce InsetsModeSession to InsetsAnimationControlImplTest

InsetsAnimationControlImplTest sets new insets mode to full mode when setUp(), which
leads some tests in ViewRootImplTest fail. Introduce InsetsModeSession
to fix it.

Change-Id: Id159db1395d1b105d9d4d3d13cdba778015e9989
Fix: 130609028
Test: atest ViewRootImplTest InsetsAnimationControlImplTest
1 file changed