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

src/gpu/GrCommandBuilder.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrCommandBuilder.h"
 
 #include "GrInOrderCommandBuilder.h"
@@ skipping 64 matching lines @@
 GrCommandBuilder::recordXferBarrierIfNecessary(const GrPipeline& pipeline,
                                                const GrDrawTargetCaps& caps) {
     const GrXferProcessor& xp = *pipeline.getXferProcessor();
     GrRenderTarget* rt = pipeline.getRenderTarget();
 
     GrXferBarrierType barrierType;
     if (!xp.willNeedXferBarrier(rt, caps, &barrierType)) {
         return NULL;
     }
 
-    XferBarrier* xb = GrNEW_APPEND_TO_RECORDER(*this->cmdBuffer(), XferBarrier, ());
+    XferBarrier* xb = GrNEW_APPEND_TO_RECORDER(*this->cmdBuffer(), XferBarrier, (rt));
     xb->fBarrierType = barrierType;
     return xb;
 }