Layer: Guard against Region offset overflows
When applying a transform to a Region, if the Region is translated to bounds that overlow the int32_t type, the process crashes. For now, we guard against process crashes by manually applying the offset to the Region and checking for overflows. If we detect an overflow in one of the Rects in a Region, we remove the Rect from the resulting Region. Bug: 234247210 Test: atest libgui_test Change-Id: Icd47539accae2e59a7dbd9c9621201bd040fc402
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