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

src/gpu/GrAADistanceFieldPathRenderer.cpp

Index: src/gpu/GrAADistanceFieldPathRenderer.cpp
diff --git a/src/gpu/GrAADistanceFieldPathRenderer.cpp b/src/gpu/GrAADistanceFieldPathRenderer.cpp
index 1858f000e46e5e54b4c4faaed90e35f4fb70d259..0428373a893c54038b97a048fc30c84dfdeb90b4 100755
--- a/src/gpu/GrAADistanceFieldPathRenderer.cpp
+++ b/src/gpu/GrAADistanceFieldPathRenderer.cpp
@@ -492,8 +492,9 @@ private:
     const SkMatrix& viewMatrix() const { return fBatch.fViewMatrix; }
     bool usesLocalCoords() const { return fBatch.fUsesLocalCoords; }
 
-    bool onCombineIfPossible(GrBatch* t) override {
-        if (!this->pipeline()->isEqual(*t->pipeline())) {
+    bool onCombineIfPossible(GrBatch* t, const GrCaps& caps) override {
+        if (!GrPipeline::CanCombine(*this->pipeline(), this->bounds(), *t->pipeline(), t->bounds(),
+                                    caps)) {
             return false;
         }