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

src/gpu/GrImmediateDrawTarget.cpp

Index: src/gpu/GrImmediateDrawTarget.cpp
diff --git a/src/gpu/GrImmediateDrawTarget.cpp b/src/gpu/GrImmediateDrawTarget.cpp
index 8088eae4a02ee7bea2e62507ba9165d3dacbfed9..999446f0a46c244790c2121612bf864c3d260f3f 100644
--- a/src/gpu/GrImmediateDrawTarget.cpp
+++ b/src/gpu/GrImmediateDrawTarget.cpp
@@ -26,14 +26,6 @@ GrImmediateDrawTarget::~GrImmediateDrawTarget() {
 }
 
 void GrImmediateDrawTarget::onDrawBatch(GrBatch* batch) {
-    const GrXferProcessor& xp = *batch->pipeline()->getXferProcessor();
-    GrRenderTarget* rt = batch->pipeline()->getRenderTarget();
-
-    GrXferBarrierType barrierType;
-    if (xp.willNeedXferBarrier(rt, *this->caps(), &barrierType)) {
-        this->getGpu()->xferBarrier(rt, barrierType);
-    }
-
     fBatchTarget.resetNumberOfDraws();
 
     batch->generateGeometry(&fBatchTarget);