Cleanup issues related to SkBitmap getSize()/extractSubset().

Some minor revisions to do cleanup regarding getSize() and extractSubset(). All
are related to avoid read/write past end of the pixel buffer when getSize() is
used on a bitmap that is the result of a call to extractSubset().

git-svn-id: http://skia.googlecode.com/svn/trunk@835 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed