tools/skui: put all enums in a common namespace

Change-Id: Icd331e8946d80652750b8b6ea0db65f5f676ac3e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/238058
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
diff --git a/samplecode/SampleStringArt.cpp b/samplecode/SampleStringArt.cpp
index 2eaf4e3..bda466c 100644
--- a/samplecode/SampleStringArt.cpp
+++ b/samplecode/SampleStringArt.cpp
@@ -50,7 +50,7 @@
         canvas->drawPath(path, paint);
     }
 
-    Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey) override {
+    Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override {
         fAngle = x/width();
         return nullptr;
     }