Add unpremultiply support and GM

R=vandebo@chromium.org, edisonn@google.com

Author: richardlin@chromium.org

Review URL: https://chromiumcodereview.appspot.com/22831039

git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@10901 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gmslides.gypi b/gmslides.gypi
index b2afc5e..24306fc 100644
--- a/gmslides.gypi
+++ b/gmslides.gypi
@@ -13,6 +13,7 @@
     '../gm/bitmapcopy.cpp',
     '../gm/bitmapmatrix.cpp',
     '../gm/bitmapfilters.cpp',
+    '../gm/bitmappremul.cpp',
     '../gm/bitmaprect.cpp',
     '../gm/bitmaprecttest.cpp',
     '../gm/bitmapscroll.cpp',