Skeleton of DM

dm/DMComparisonTask.cpp

Index: dm/DMComparisonTask.cpp
diff --git a/dm/DMComparisonTask.cpp b/dm/DMComparisonTask.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f4f742c921077da558e0cad60cc6ea5569fcd0c1
--- /dev/null
+++ b/dm/DMComparisonTask.cpp
@@ -0,0 +1,22 @@
+#include "DMComparisonTask.h"
+#include "DMUtil.h"
+
+namespace DM {
+
+ComparisonTask::ComparisonTask(const Task& parent,
+                               skiagm::Expectations expectations,
+                               SkBitmap bitmap)
+    : Task(parent)
+    , fName(parent.name())  // Masquerade as parent so failures are attributed to it.
+    , fExpectations(expectations)
+    , fBitmap(bitmap)
+    {}
+
+void ComparisonTask::draw() {
+    const skiagm::GmResultDigest digest(fBitmap);
+    if (!meetsExpectations(fExpectations, digest)) {
+        this->fail();
+    }
+}
+
+}  // namespace DM