Check for xfer barriers in GrBatch, auto-issue barriers in GrGpu

src/gpu/GrTargetCommands.cpp

Index: src/gpu/GrTargetCommands.cpp
diff --git a/src/gpu/GrTargetCommands.cpp b/src/gpu/GrTargetCommands.cpp
index c712ac0643672fed2584f55485a1ecb9ed8d3253..474bbbd787579d596bdbfde3b58bd0f82cc91d01 100644
--- a/src/gpu/GrTargetCommands.cpp
+++ b/src/gpu/GrTargetCommands.cpp
@@ -75,7 +75,7 @@ void GrTargetCommands::DrawPaths::execute(GrGpu* gpu) {
                                     fTransformType, fCount);
 }
 
-void GrTargetCommands::DrawBatch::execute(GrGpu*) {
+void GrTargetCommands::DrawBatch::execute(GrGpu* gpu) {
     fBatchTarget->flushNext(fBatch->numberOfDraws());
 }
 
@@ -94,7 +94,3 @@ void GrTargetCommands::ClearStencilClip::execute(GrGpu* gpu) {
 void GrTargetCommands::CopySurface::execute(GrGpu* gpu) {
     gpu->copySurface(this->dst(), this->src(), fSrcRect, fDstPoint);
 }
-
-void GrTargetCommands::XferBarrier::execute(GrGpu* gpu) {
-    gpu->xferBarrier(fRenderTarget.get(), fBarrierType);
-}