Skeleton of DM

dm/DMComparisonTask.h

Index: dm/DMComparisonTask.h
diff --git a/dm/DMComparisonTask.h b/dm/DMComparisonTask.h
new file mode 100644
index 0000000000000000000000000000000000000000..722943968f1f4f7535bd3c700cf515517248e235
--- /dev/null
+++ b/dm/DMComparisonTask.h
@@ -0,0 +1,31 @@
+#ifndef DMComparisonTask_DEFINED
+#define DMComparisonTask_DEFINED
+
+#include "DMTask.h"
+#include "SkBitmap.h"
+#include "SkString.h"
+#include "gm_expectations.h"
+
+namespace DM {
+
+// We use ComparisonTask to move CPU-bound comparison work of GpuTasks back to
+// the main thread pool, where we probably have more threads available.
+
+class ComparisonTask : public Task {
+public:
+    ComparisonTask(const Task& parent, skiagm::Expectations, SkBitmap);
+
+    void draw();
+    bool usesGpu() const { return false; }
+    bool shouldSkip() const { return false; }
+    SkString name() const { return fName; }
+
+private:
+    const SkString fName;
+    const skiagm::Expectations fExpectations;
+    const SkBitmap fBitmap;
+};
+
+}  // namespace DM
+
+#endif  // DMComparisonTask_DEFINED