Install a hook to swap between SkPicture backends with a single define.

dm/DMSerializeTask.cpp

 #include "DMSerializeTask.h"
 #include "DMUtil.h"
 #include "DMWriteTask.h"
 
 #include "SkCommandLineFlags.h"
 #include "SkPicture.h"
 #include "SkPixelRef.h"
 
-DEFINE_bool(serialize, true, "If true, run picture serialization tests.");
-DECLARE_bool(skr);  // in DMReplayTask.cpp
+DEFINE_bool(serialize,     true, "If true, run picture serialization tests via SkPictureData.");
+DEFINE_bool(serialize_skr, true, "If true, run picture serialization tests via SkRecord.");
 
 static const char* kSuffixes[] = { "serialize", "serialize_skr" };
-static const bool* kEnabled[]  = { &FLAGS_serialize, &FLAGS_skr };
+static const bool* kEnabled[]  = { &FLAGS_serialize, &FLAGS_serialize_skr };
 
 namespace DM {
 
 SerializeTask::SerializeTask(const Task& parent,
                              skiagm::GM* gm,
                              SkBitmap reference,
                              SerializeTask::Mode mode)
     : CpuTask(parent)
     , fMode(mode)
     , fName(UnderJoin(parent.name().c_str(), kSuffixes[mode]))
@@ skipping 20 matching lines @@
 }
 
 bool SerializeTask::shouldSkip() const {
     if (fGM->getFlags() & skiagm::GM::kSkipPicture_Flag) {
         return true;
     }
     return !*kEnabled[fMode];
 }
 
 }  // namespace DM