Support serialization in SkRecord-backed SkPictures.

dm/DMReplayTask.h

 #ifndef DMReplayTask_DEFINED
 #define DMReplayTask_DEFINED
 
 #include "DMTask.h"
 #include "SkBitmap.h"
 #include "SkString.h"
 #include "SkTemplates.h"
 #include "gm.h"
 
 // Records a GM through an SkPicture, draws it, and compares against the reference bitmap.
 
 namespace DM {
 
 class ReplayTask : public CpuTask {
 
 public:
     enum Mode {
         kNormal_Mode,
         kRTree_Mode,
+        kSkRecord_Mode,
     };
     ReplayTask(const Task& parent,  // ReplayTask must be a child task.  Pass its parent here.
                skiagm::GM*,         // GM to run through a picture.  Takes ownership.
                SkBitmap reference,  // Bitmap to compare picture replay results to.
                Mode);
 
     virtual void draw() SK_OVERRIDE;
     virtual bool shouldSkip() const SK_OVERRIDE;
     virtual SkString name() const SK_OVERRIDE { return fName; }
 
 private:
-    const bool fUseRTree;
+    const Mode fMode;
     const SkString fName;
     SkAutoTDelete<skiagm::GM> fGM;
     const SkBitmap fReference;
 };
 
 }  // namespace DM
 
 #endif  // DMReplayTask_DEFINED