Fixing view highlighting on Android P

[shashachu]

Fixes #648

clipOutRect wasn't the proper API to use in this case, so changed to use save and restore.

Based on this SO answer: https://stackoverflow.com/questions/50231950/what-is-the-best-alternative-to-canvas-cliprect-with-region-op-replace/50247323#50247323

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[shashachu]

@jasta is this library still being maintained? Would appreciate this PR getting merged so we can stop using a locally-built stetho version.

[obsantos]

Can this be merged please?

[fanky10]

looks good to me