Initialize Task surface as invisible

While app cold launch and combine to split, sometimes race happend
and cause child task surface still hidden.
Fix this issue by initializing task as invisible so it would not
set surface as hide when first prepareSurface.

Fix: 262478804
Test: manual
Test: pass existing tests
Change-Id: Iaa93fee162fc8bc4b60aac9ff8faea6943cd01d5