AARectBatch can transform coords on cpu

src/gpu/GrBatch.h

Index: src/gpu/GrBatch.h
diff --git a/src/gpu/GrBatch.h b/src/gpu/GrBatch.h
index 51c556e737a0b6a9a15f23f2db233b86a19e2138..a8dac38f71e409a8da5bd03ec63de9091007da55 100644
--- a/src/gpu/GrBatch.h
+++ b/src/gpu/GrBatch.h
@@ -94,7 +94,10 @@ public:
     SkDEBUGCODE(bool isUsed() const { return fUsed; })
 
     const GrPipeline* pipeline() const { return fPipeline; }
-    void setPipeline(const GrPipeline* pipeline) { fPipeline.reset(SkRef(pipeline)); }
+    void setPipeline(const GrPipeline* pipeline) {
+        fPipeline.reset(SkRef(pipeline));
+        this->onSetPipeline();
+    }
 
 protected:
     template <typename PROC_SUBCLASS> void initClassID() {
@@ -164,6 +167,8 @@ private:
         return id;
     }
 
+    virtual void onSetPipeline() {}
+
     enum {
         kIllegalBatchClassID = 0,
     };