Improve SurfaceView bounds calculation

Estimate SurfaceView bounds conservatively to handle GPU rounding
errors. When SurfaceView border is in the middle of a pixel,
a fudge factor is added or substracted to always extend the region.

Test: passed CTS tests
Bug: 131240729
Change-Id: I74d5c1b40f9e730758f26341eb4a028bbae6ecd9