SkNonCopyable should be used with private inheritance.

include/core/SkDrawLooper.h

Index: include/core/SkDrawLooper.h
diff --git a/include/core/SkDrawLooper.h b/include/core/SkDrawLooper.h
index 3c45a6a5b635f5f563881efe2e433256d9915082..cc42952d07acc289ce21ee2cbd75de5a0a74c4e9 100644
--- a/include/core/SkDrawLooper.h
+++ b/include/core/SkDrawLooper.h
@@ -35,7 +35,7 @@ public:
      *  Subclasses of SkDrawLooper should create a subclass of this object to
      *  hold state specific to their subclass.
      */
-    class SK_API Context : public SkNoncopyable {
+    class SK_API Context : ::SkNoncopyable {
     public:
         Context() {}
         virtual ~Context() {}