DM: duh, don't calculate digests unless we're going to look at them.

dm/DMReplayTask.h

 #ifndef DMReplayTask_DEFINED
 #define DMReplayTask_DEFINED
 
 #include "DMReporter.h"
 #include "DMTask.h"
 #include "DMTaskRunner.h"
 #include "SkBitmap.h"
 #include "SkString.h"
 #include "SkTemplates.h"
 #include "gm.h"
 #include "gm_expectations.h"
 
-// Records a GM through an SkPicture, draws it, and compares against the reference checksum.
+// Records a GM through an SkPicture, draws it, and compares against the reference bitmap.
 
 namespace DM {
 
 class ReplayTask : public Task {
 
 public:
     ReplayTask(const char* name,
                const Task& parent,
                skiagm::GM*,
-               skiagm::GmResultDigest reference,
-               SkBitmap::Config);
+               SkBitmap reference);
 
     virtual void draw() SK_OVERRIDE;
     virtual bool usesGpu() const SK_OVERRIDE { return false; }
     virtual bool shouldSkip() const SK_OVERRIDE;
     virtual SkString name() const SK_OVERRIDE { return fName; }
 
 private:
     const SkString fName;
     SkAutoTDelete<skiagm::GM> fGM;
-    const skiagm::GmResultDigest fReference;
-    const SkBitmap::Config fConfig;
+    const SkBitmap fReference;
 };
 
 }  // namespace DM
 
 #endif  // DMReplayTask_DEFINED