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

src/gpu/batches/GrTestBatch.h

Index: src/gpu/batches/GrTestBatch.h
diff --git a/src/gpu/batches/GrTestBatch.h b/src/gpu/batches/GrTestBatch.h
index 55cc5c25a5ede4410c09c1c041c42b62b88f3d7a..68ea676d254722a4903d3e6da1ca3c2a1d28ea58 100644
--- a/src/gpu/batches/GrTestBatch.h
+++ b/src/gpu/batches/GrTestBatch.h
@@ -66,7 +66,7 @@ private:
     virtual Geometry* geoData(int index) = 0;
     virtual const Geometry* geoData(int index) const = 0;
 
-    bool onCombineIfPossible(GrBatch* t) override {
+    bool onCombineIfPossible(GrBatch* t, const GrCaps&) override {
         return false;
     }