Bug 925685 - Make test keyboard app change its window height correctly, r=timdream
Merge pull request #13933 from luke-chang/925685_test_keyboard_app_height_v1.2_uplift

Bug 925685 - Make test keyboard app change its window height correctly
(cherry picked from commit 18024ff6a29439023b546c6f269bc964e0aadc32)