Skeleton of DM

dm/DMUtil.h

+#ifndef DMUtil_DEFINED
+#define DMUtil_DEFINED
+
+#include "SkString.h"
+#include "gm_expectations.h"
+
+// Small free functions used in more than one place in DM.
+
+namespace DM {
+
+// underJoin("a", "b") -> "a_b"
+SkString underJoin(const char* a, const char* b);
+
+// png("a") -> "a.png"
+SkString png(SkString s);
+
+// Roughly, expectations.match(digest), but only does it if we're not ignoring the result.
+bool meetsExpectations(const skiagm::Expectations& expectations,
+                       const skiagm::GmResultDigest& digest);
+
+}  // namespace DM
+
+#endif  // DMUtil_DEFINED