change setAlphaType to not modify the pixelref's genID
authorreed@google.com <reed@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81>
Tue, 28 Jan 2014 16:05:39 +0000 (16:05 +0000)
committerreed@google.com <reed@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81>
Tue, 28 Jan 2014 16:05:39 +0000 (16:05 +0000)
commitc1587f94a77eaafe257a6ecf504364d40362c66a
tree64126ea39cdada39b348437f84edb860ee67d3bc
parenta96176dc0315d786c187bfa9be5dccf2f08feba2
change setAlphaType to not modify the pixelref's genID

BUG=skia:
R=bsalomon@google.com, halcanary@google.com

Review URL: https://codereview.chromium.org/137263009

git-svn-id: http://skia.googlecode.com/svn/trunk@13219 2bbb7eff-a529-9590-31e7-b0007b416f81
include/core/SkBitmap.h
include/core/SkPixelRef.h
src/core/SkBitmap.cpp
src/core/SkPixelRef.cpp