Skeleton of DM

dm/DMUtil.cpp

+#include "DMUtil.h"
+
+namespace DM {
+
+SkString underJoin(const char* a, const char* b) {
+    SkString s;
+    s.appendf("%s_%s", a, b);
+    return s;
+}
+
+SkString png(SkString s) {
+    s.appendf(".png");
+    return s;
+}
+
+bool meetsExpectations(const skiagm::Expectations& expectations,
+                       const skiagm::GmResultDigest& digest) {
+    return expectations.ignoreFailure()
+        || expectations.empty()
+        || expectations.match(digest);
+}
+
+}  // namespace DM