Enable stencil clipping in mixed sampled render targets

src/gpu/GrRenderTargetPriv.h

Index: src/gpu/GrRenderTargetPriv.h
diff --git a/src/gpu/GrRenderTargetPriv.h b/src/gpu/GrRenderTargetPriv.h
index f4931db1db7475feab36d24f163aeec8b4bc0f7e..2f97b41e1de1faf76f3f54f46d23739f3d5a17bc 100644
--- a/src/gpu/GrRenderTargetPriv.h
+++ b/src/gpu/GrRenderTargetPriv.h
@@ -27,6 +27,21 @@ public:
      */
     bool attachStencilAttachment(GrStencilAttachment* stencil);
 
+    /**
+     * @return true if sample locations colocated at pixel center have been set for this
+     *         render target.  Requires support for NV_sample_locations.
+     */
+    bool usesColocatedSampleLocations() const {
+        return fRenderTarget->fUsesColocatedSampleLocations;
+    }
+
+    /**
+     * Flag render target as using or not using sample locations colocated at pixel center.
+     */
+    void flagAsUsingColocatedSampleLocations(bool useColocatedSampleLocations) {
+        fRenderTarget->fUsesColocatedSampleLocations = useColocatedSampleLocations;
+    }
+
 private:
     explicit GrRenderTargetPriv(GrRenderTarget* renderTarget) : fRenderTarget(renderTarget) {}
     GrRenderTargetPriv(const GrRenderTargetPriv&) {} // unimpl