Move SkColorFilterImageFilter into its own file.

Review URL:  https://codereview.appspot.com/6463072/



git-svn-id: http://skia.googlecode.com/svn/trunk@5197 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/imagefiltersbase.cpp b/gm/imagefiltersbase.cpp
index b17ba75..31af2c8 100644
--- a/gm/imagefiltersbase.cpp
+++ b/gm/imagefiltersbase.cpp
@@ -12,6 +12,7 @@
 #include "SkShader.h"
 
 #include "SkBlurImageFilter.h"
+#include "SkColorFilterImageFilter.h"
 #include "SkTestImageFilters.h"
 
 class FailImageFilter : public SkImageFilter {