Sketch DM refactor.

dm/DMTaskRunner.cpp

Index: dm/DMTaskRunner.cpp
diff --git a/dm/DMTaskRunner.cpp b/dm/DMTaskRunner.cpp
deleted file mode 100644
index 92381a7a7ec1052d45e72f158f12c9e95e5fb623..0000000000000000000000000000000000000000
--- a/dm/DMTaskRunner.cpp
+++ /dev/null
@@ -1,17 +0,0 @@
-#include "DMTaskRunner.h"
-#include "DMTask.h"
-
-namespace DM {
-
-void TaskRunner::add(CpuTask* task) { fCpuWork.add(task);  }
-void TaskRunner::add(GpuTask* task) { fGpuWork.push(task); }
-
-void TaskRunner::wait() {
-    GrContextFactory factory;
-    for (int i = 0; i < fGpuWork.count(); i++) {
-        fGpuWork[i]->run(&factory);
-    }
-    fCpuWork.wait();
-}
-
-}  // namespace DM