Support serialization in SkRecord-backed SkPictures.

dm/DMSerializeTask.h

 #ifndef DMSerializeTask_DEFINED
 #define DMSerializeTask_DEFINED
 
 #include "DMTask.h"
 #include "SkBitmap.h"
 #include "SkString.h"
 #include "SkTemplates.h"
 #include "gm.h"
 
 // Record a picture, serialize it, deserialize it, then draw it and compare to reference bitmap.
 
 namespace DM {
 
 class SerializeTask : public CpuTask {
 
 public:
+    enum Mode {
+        kNormal_Mode,
+        kSkRecord_Mode,
+    };
     SerializeTask(const Task& parent,
                   skiagm::GM*,
-                  SkBitmap reference);
+                  SkBitmap reference,
+                  Mode mode);
 
     virtual void draw() SK_OVERRIDE;
     virtual bool shouldSkip() const SK_OVERRIDE;
     virtual SkString name() const SK_OVERRIDE { return fName; }
 
 private:
+    const Mode fMode;
     const SkString fName;
     SkAutoTDelete<skiagm::GM> fGM;
     const SkBitmap fReference;
 };
 
 }  // namespace DM
 
 #endif  // DMSerializeTask_DEFINED