Account for color blending at the edge

We might get color blending on the pixel at the border of the color change which means we need to accomodate that with a higher variance tolerance at the border

Test: atest CtsWindowManagerDeviceTestCases:ActivityTransitionTests on a large device where the problem is more apparent

Bug: 234308396
Change-Id: I34de531f31a50a4b82d578d0173011d8aa259d5b
1 file changed