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

src/gpu/GrPathRendering.h

Index: src/gpu/GrPathRendering.h
diff --git a/src/gpu/GrPathRendering.h b/src/gpu/GrPathRendering.h
index 527a8430c5ec8e35763d6514fd1ece52d2e5c943..f13a190829e8b48b4742f17c4b9ea6a8c96bd0ec 100644
--- a/src/gpu/GrPathRendering.h
+++ b/src/gpu/GrPathRendering.h
@@ -11,6 +11,7 @@
 #include "SkPath.h"
 #include "GrGpu.h"
 #include "GrPathRange.h"
+#include "GrPipeline.h"
 
 class SkDescriptor;
 class SkTypeface;
@@ -166,6 +167,9 @@ public:
 
     void drawPath(const DrawPathArgs& args, const GrPath* path) {
         fGpu->handleDirtyContext();
+        if (GrXferBarrierType barrierType = args.fPipeline->xferBarrierType(*fGpu->caps())) {
+            fGpu->xferBarrier(args.fPipeline->getRenderTarget(), barrierType);
+        }
         this->onDrawPath(args, path);
     }
 
@@ -173,10 +177,14 @@ public:
                    PathIndexType indexType, const float transformValues[],
                    PathTransformType transformType, int count) {
         fGpu->handleDirtyContext();
+        if (GrXferBarrierType barrierType = args.fPipeline->xferBarrierType(*fGpu->caps())) {
+            fGpu->xferBarrier(args.fPipeline->getRenderTarget(), barrierType);
+        }
         pathRange->willDrawPaths(indices, indexType, count);
         this->onDrawPaths(args, pathRange, indices, indexType, transformValues, transformType,
                           count);
     }
+
 protected:
     GrPathRendering(GrGpu* gpu)
         : fGpu(gpu) {