DM: add --writePath

dm/DMCpuTask.cpp

 #include "DMCpuTask.h"
 #include "DMReplayTask.h"
 #include "DMUtil.h"
+#include "DMWriteTask.h"
 #include "SkCommandLineFlags.h"
 
 DEFINE_bool(replay, false, "If true, run replay tests for each CpuTask.");
 // TODO(mtklein): add the other various options
 
 namespace DM {
 
 CpuTask::CpuTask(const char* name,
                  Reporter* reporter,
                  TaskRunner* taskRunner,
@@ skipping 20 matching lines @@
     canvas.flush();
 
     if (!meetsExpectations(fExpectations, bitmap)) {
         this->fail();
     }
 
     if (FLAGS_replay) {
         this->spawnChild(SkNEW_ARGS(ReplayTask,
                                    ("replay", *this, fGMFactory(NULL), bitmap)));
     }
+    this->spawnChild(SkNEW_ARGS(WriteTask, (*this, bitmap)));
 }
 
 bool CpuTask::shouldSkip() const {
     if (SkBitmap::kRGB_565_Config == fConfig && (fGM->getFlags() & skiagm::GM::kSkip565_Flag)) {
         return true;
     }
     if (fGM->getFlags() & skiagm::GM::kGPUOnly_Flag) {
         return true;
     }
     return false;
 }
 
 }  // namespace DM