Revert of Sketch DM refactor.

dm/DMTaskRunner.cpp

Index: dm/DMTaskRunner.cpp
diff --git a/dm/DMTaskRunner.cpp b/dm/DMTaskRunner.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..92381a7a7ec1052d45e72f158f12c9e95e5fb623
--- /dev/null
+++ b/dm/DMTaskRunner.cpp
@@ -0,0 +1,17 @@
+#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