turn back on gpu tests

dm/DMGpuSupport.cpp

Index: dm/DMGpuSupport.cpp
diff --git a/dm/DMGpuSupport.cpp b/dm/DMGpuSupport.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..87a406b4846f110267ca41f7618b75fbfddbb804
--- /dev/null
+++ b/dm/DMGpuSupport.cpp
@@ -0,0 +1,9 @@
+#include "DMGpuSupport.h"
+#include "SkTLS.h"
+
+static void* create_gr_factory()        { return new GrContextFactory; }
+static void  delete_gr_factory(void* p) { delete (GrContextFactory*)p; }
+
+GrContextFactory* GetThreadLocalGrContextFactory() {
+    return (GrContextFactory*)SkTLS::Get(create_gr_factory, delete_gr_factory);
+}