Fixing type mask computation in SkMatrix to make it faster and make it so that matric...

Fixing type mask computation in SkMatrix to make it faster and make it so that matrices have the same type masks as their inverses.
This patch also add bench tests that call invert() followed by mapRect() on various types of matrices.  Performance of these tests was greatly affected by typemask computation

Review URL: http://codereview.appspot.com/6380043/
BUG=https://code.google.com/p/chromium/issues/detail?id=135259

git-svn-id: http://skia.googlecode.com/svn/trunk@4562 2bbb7eff-a529-9590-31e7-b0007b416f81