Add SK_SUPPORT_LEGACY_DRAWFILTER guard around calls to SkCanvas::(get|set)DrawFilter.

tests/CanvasStateTest.cpp

Index: tests/CanvasStateTest.cpp
diff --git a/tests/CanvasStateTest.cpp b/tests/CanvasStateTest.cpp
index 4f5fb463e3a3461bd0c22bff432d6977c1e92f8f..6e5af3303bebb66ffbfbd951db72ff992484de71 100644
--- a/tests/CanvasStateTest.cpp
+++ b/tests/CanvasStateTest.cpp
@@ -252,6 +252,8 @@ DEF_TEST(CanvasState_test_complex_clips, reporter) {
 
 ////////////////////////////////////////////////////////////////////////////////
 
+#ifdef SK_SUPPORT_LEGACY_DRAWFILTER
+
 class TestDrawFilter : public SkDrawFilter {
 public:
     bool filter(SkPaint*, Type) override { return true; }
@@ -277,6 +279,8 @@ DEF_TEST(CanvasState_test_draw_filters, reporter) {
     SkCanvasStateUtils::ReleaseCanvasState(state);
 }
 
+#endif
+
 ////////////////////////////////////////////////////////////////////////////////
 
 // we need this function to prevent SkError from printing to stdout