Revert "Revert "change SkColorTable to be immutable""

This reverts commit b8162cb840f4cb6002ef68d5ac775c6a122c52a9.

Fixed was call-sites in benches that used the (now gone) setIsOpaque api.

R=scroggo@google.com

Review URL: https://codereview.chromium.org/26572006

git-svn-id: http://skia.googlecode.com/svn/trunk/include@11695 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed