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

src/gpu/batches/GrStrokeRectBatch.h

Index: src/gpu/batches/GrStrokeRectBatch.h
diff --git a/src/gpu/batches/GrStrokeRectBatch.h b/src/gpu/batches/GrStrokeRectBatch.h
index 3a20d9bfcb73a30c733e6f6b34df2f2aaa8277bd..7979a6492d856ae5bee0e774520da8eee421f8a0 100644
--- a/src/gpu/batches/GrStrokeRectBatch.h
+++ b/src/gpu/batches/GrStrokeRectBatch.h
@@ -50,10 +50,11 @@ private:
     bool hairline() const { return fBatch.fHairline; }
     bool coverageIgnored() const { return fBatch.fCoverageIgnored; }
 
-    bool onCombineIfPossible(GrBatch* t) override {
-        //if (!this->pipeline()->isEqual(*t->pipeline())) {
-        //    return false;
-        //}
+    bool onCombineIfPossible(GrBatch* t, const GrCaps&) override {
+        // if (!GrPipeline::CanCombine(*this->pipeline(), this->bounds(), *t->pipeline(),
+        //     t->bounds(), caps)) {
+        //     return false;
+        // }
         // GrStrokeRectBatch* that = t->cast<StrokeRectBatch>();
 
         // NonAA stroke rects cannot batch right now