Move IOType to GrGpuRef and rename that to GrIORef. Template GrPendingIORef on IOType.

src/gpu/GrDrawState.h

Index: src/gpu/GrDrawState.h
diff --git a/src/gpu/GrDrawState.h b/src/gpu/GrDrawState.h
index 4d720624aa3045c996f5329695ef763d049770e9..458fb958e64d8b9830beacf22e5a6af1e9a21ba1 100644
--- a/src/gpu/GrDrawState.h
+++ b/src/gpu/GrDrawState.h
@@ -405,7 +405,7 @@ public:
      * @param target  The render target to set.
      */
     void setRenderTarget(GrRenderTarget* target) {
-        fRenderTarget.set(SkSafeRef(target), GrGpuResourceRef::kWrite_IOType);
+        fRenderTarget.set(SkSafeRef(target), GrIORef::kWrite_IOType);
         this->invalidateOptState();
     }