Add GM to test bitmap shaders with basic geometry and bitmap masks.

R=reed@google.com, bsalomon@google.com, rmistry@google.com

Author: djsollen@google.com

Review URL: https://codereview.chromium.org/98433004

git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@12543 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gmslides.gypi b/gmslides.gypi
index f8f38e9..149d037 100644
--- a/gmslides.gypi
+++ b/gmslides.gypi
@@ -20,6 +20,7 @@
     '../gm/bitmaprect.cpp',
     '../gm/bitmaprecttest.cpp',
     '../gm/bitmapscroll.cpp',
+    '../gm/bitmapshader.cpp',
     '../gm/bleed.cpp',
     '../gm/blurs.cpp',
     '../gm/blurquickreject.cpp',