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

src/gpu/batches/GrDrawVerticesBatch.h

Index: src/gpu/batches/GrDrawVerticesBatch.h
diff --git a/src/gpu/batches/GrDrawVerticesBatch.h b/src/gpu/batches/GrDrawVerticesBatch.h
index a59518a8fec9d91991dae0d8806e7fc939d93675..9446d88bde0f7e3c6b2d54b81b4ac136c827e6ad 100644
--- a/src/gpu/batches/GrDrawVerticesBatch.h
+++ b/src/gpu/batches/GrDrawVerticesBatch.h
@@ -75,7 +75,7 @@ private:
     int indexCount() const { return fBatch.fIndexCount; }
     bool coverageIgnored() const { return fBatch.fCoverageIgnored; }
 
-    bool onCombineIfPossible(GrBatch* t) override;
+    bool onCombineIfPossible(GrBatch* t, const GrCaps&) override;
 
     struct BatchTracker {
         GrPrimitiveType fPrimitiveType;