Commits
henry.uh_chen authored and Chen Henry committed 3a1bffa835f
[HWUI] Fix invisible views are still shown in popup window
Symptom: Invisible views are still shown in popup window
Root Cause: glClear isn't called if there is no draw command
Solution: Even if there is no draw command, it still calls glClear
by startFrame().
Reproduce steps: App set one view in a popup window to invisible,
it will be still visible.
Change-Id: I36bc7b752434ad388fbb80ea63341ac778f48d35