Don't issue texture barriers for RT's with separate storage

src/gpu/GrTargetCommands.cpp

Index: src/gpu/GrTargetCommands.cpp
diff --git a/src/gpu/GrTargetCommands.cpp b/src/gpu/GrTargetCommands.cpp
index 7e57c0329190a328782050d7355d480118f66455..096d429dea31bc2971c143b7fcceabe226d11aef 100644
--- a/src/gpu/GrTargetCommands.cpp
+++ b/src/gpu/GrTargetCommands.cpp
@@ -111,5 +111,5 @@ void GrTargetCommands::CopySurface::execute(GrGpu* gpu) {
 }
 
 void GrTargetCommands::XferBarrier::execute(GrGpu* gpu) {
-    gpu->xferBarrier(fBarrierType);
+    gpu->xferBarrier(fRenderTarget.get(), fBarrierType);
 }