When extractAlpha() native method in Skia fails to allocate pixels, it resets target bitmap. This change detects when such empty bitmap is returned, and throws a OutOfMemory Java exception. Depends on https://android-git.corp.google.com/g/97793 Bug: 3418381 Change-Id: I65a84998be089c49ed5005f6995bdc4f4d1669bc