SurfaceFlinger: Avoid entering resize-pending state when we don't have a buffer.

We'd like bufferless Surfaces to always behave as if it were scaling mode SCALE_TO_WINDOW.
Some additional discussion in inline comment.

Test: Transaction_test.cpp
Change-Id: Ifb176b7b05954c1d3d9ee885cb8f4c51559b922b
2 files changed