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

src/gpu/batches/GrDrawAtlasBatch.h

Index: src/gpu/batches/GrDrawAtlasBatch.h
diff --git a/src/gpu/batches/GrDrawAtlasBatch.h b/src/gpu/batches/GrDrawAtlasBatch.h
index bc882b2bfa55289191c02d8c07d13809acf809b6..e6ce7a03dff736329e0b2c6d02253c87a31e7112 100644
--- a/src/gpu/batches/GrDrawAtlasBatch.h
+++ b/src/gpu/batches/GrDrawAtlasBatch.h
@@ -56,7 +56,7 @@ private:
     int quadCount() const { return fQuadCount; }
     bool coverageIgnored() const { return fCoverageIgnored; }
     
-    bool onCombineIfPossible(GrBatch* t) override;
+    bool onCombineIfPossible(GrBatch* t, const GrCaps&) override;
     SkSTArray<1, Geometry, true> fGeoData;
     
     SkMatrix fViewMatrix;