Reland of add a ClassID function to GrBatch

tests/GrPorterDuffTest.cpp

Index: tests/GrPorterDuffTest.cpp
diff --git a/tests/GrPorterDuffTest.cpp b/tests/GrPorterDuffTest.cpp
index 1328272a6a5e87fb749b5315fd0ec9b66bda4698..a61ab5484ba401a6027bbc6aa3089d26ffed9527 100644
--- a/tests/GrPorterDuffTest.cpp
+++ b/tests/GrPorterDuffTest.cpp
@@ -1093,7 +1093,13 @@
 }
 
 static void test_lcd_coverage_fallback_case(skiatest::Reporter* reporter, const GrCaps& caps) {
-    class : public GrVertexBatch {
+    class TestLCDCoverageBatch: public GrVertexBatch {
+    public:
+        DEFINE_BATCH_CLASS_ID
+
+        TestLCDCoverageBatch() : INHERITED(ClassID()) {}
+
+    private:
         void getInvariantOutputColor(GrInitInvariantOutput* out) const override {
             out->setKnownFourComponents(GrColorPackRGBA(123, 45, 67, 221));
         }
@@ -1108,6 +1114,7 @@
         bool onCombineIfPossible(GrBatch*, const GrCaps&) override  { return false; }
         void onPrepareDraws(Target*) override {};
 
+        typedef GrVertexBatch INHERITED;
     } testLCDCoverageBatch;
 
     GrProcOptInfo colorPOI, covPOI;