remove remaining references to porterduff



git-svn-id: http://skia.googlecode.com/svn/trunk@236 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/gm_files.mk b/gm/gm_files.mk
new file mode 100644
index 0000000..02a416c
--- /dev/null
+++ b/gm/gm_files.mk
@@ -0,0 +1,7 @@
+SOURCE := \
+	bitmapfilters.cpp \
+	filltypes.cpp \
+	gradients.cpp \
+	tilemodes.cpp \
+	xfermodes.cpp \
+	gmmain.cpp