Avoid generating an outline that is not contained within view's bounds.

Given that the outline rect starts with an origin of (-1,-1) when we
combine that with the clipRect that has an origin of (0,0) it causes
the HWUI renderer to perform pathOps and draw more complex shadows than
necessary.

Bug: 64487466
Test: SystemUiJankTests#testRecentAppsFling
Change-Id: Icb932343e6bbc053335bd007d49692262dbba72a