make explicit the requirement that all colorfilters are reentrant-safe

src/core/SkPicturePlayback.cpp

Index: src/core/SkPicturePlayback.cpp
diff --git a/src/core/SkPicturePlayback.cpp b/src/core/SkPicturePlayback.cpp
index 04c90cee9277f98add60de4710d79de8babb7f96..f95c44343dc3ccada3289058760854a5213ad308 100644
--- a/src/core/SkPicturePlayback.cpp
+++ b/src/core/SkPicturePlayback.cpp
@@ -150,15 +150,15 @@ static bool needs_deep_copy(const SkPaint& paint) {
     /*
      *  These fields are known to be immutable, and so can be shallow-copied
      *
-     *  getTypeface();
-     *  getAnnotation();
-     *  getXfermode();
+     *  getTypeface()
+     *  getAnnotation()
+     *  paint.getColorFilter()

[mtklein, 2013/10/10 17:33:14]

remove paint.?

+     *  getXfermode()
      */
 
     return paint.getPathEffect() ||
            paint.getShader() ||
            paint.getMaskFilter() ||
-           paint.getColorFilter() ||
            paint.getRasterizer() ||
            paint.getLooper() ||
            paint.getImageFilter();