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

tests/GrPorterDuffTest.cpp

Index: tests/GrPorterDuffTest.cpp
diff --git a/tests/GrPorterDuffTest.cpp b/tests/GrPorterDuffTest.cpp
index 087e915776c4022bdb9041c99c47752486c6df39..0cd1db0131d84318a9de163d121d40f7ead476ee 100644
--- a/tests/GrPorterDuffTest.cpp
+++ b/tests/GrPorterDuffTest.cpp
@@ -910,7 +910,7 @@ static void test_lcd_coverage(skiatest::Reporter* reporter, const GrCaps& caps)
 
         const char* name() const override { return "Test LCD Text Batch"; }
         void initBatchTracker(const GrPipelineOptimizations&) override {}
-        bool onCombineIfPossible(GrBatch*) override  { return false; }
+        bool onCombineIfPossible(GrBatch*, const GrCaps&) override  { return false; }
         void generateGeometry(GrBatchTarget*) override {}
 
     } testLCDCoverageBatch;