add Qt5ScreenChanged signal for Qt5 screen changed bug

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/b07eb3df2095427cb7c7f1666fee8294/

Change-Id: I98a885f17004982fee4e9530240f57021bfd44c2
Merge "add Qt5ScreenChanged signal for Qt5 screen changed bug"