New API for computing optimization invariants.

src/gpu/batches/GrTInstanceBatch.h

Index: src/gpu/batches/GrTInstanceBatch.h
diff --git a/src/gpu/batches/GrTInstanceBatch.h b/src/gpu/batches/GrTInstanceBatch.h
index 5dc5988e58a6d0d930fa6cf287bb3daa81802b4c..9bde4441ede01732ebec3ef0e1fa7f34b291295b 100644
--- a/src/gpu/batches/GrTInstanceBatch.h
+++ b/src/gpu/batches/GrTInstanceBatch.h
@@ -59,13 +59,12 @@ public:
         return str;
     }
 
-    void getInvariantOutputColor(GrInitInvariantOutput* out) const override {
+    void computeBatchToXPOverrides(GrInitInvariantOutput* color, GrInitInvariantOutput* coverage,
+                                   bool* usePLSDstRead) const {
         // When this is called on a batch, there is only one geometry bundle
-        out->setKnownFourComponents(fGeoData[0].fColor);
-    }
-
-    void getInvariantOutputCoverage(GrInitInvariantOutput* out) const override {
-        Impl::InitInvariantOutputCoverage(out);
+        color->setKnownFourComponents(fGeoData[0].fColor);
+        Impl::InitInvariantOutputCoverage(coverage);
+        *usePLSDstRead = false;
     }
 
     void initBatchTracker(const GrPipelineOptimizations& opt) override {