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Calling this after jni_on_load fixes the unity apps. This is
not exactly correct since we may already have the following chain.

Start up:
Us -> debuggerd

After app goes in front:
App -> us -> debuggerd

After we put ourself back at the front:
Us -> app -> us -> app -> .... stack overflow.

Bug: 17620677
Change-Id: I9183997e3d5ebd51c320b5d51425be5142e938f3

(cherry picked from commit 1f24296c)