Add JNI String.<init> test for global and weak global refs.

Test for change:
https://android-review.googlesource.com/#/c/152265/

(cherry picked from commit 7be83025b62ab499ed8b2b59521f8fbe8e2b13ab)

Change-Id: If10a5fcf7a554d798d2bb21d493e5a7266ed0079
1 file changed