Implement support for mixed sampled render targets

src/gpu/GrPipelineBuilder.h

Index: src/gpu/GrPipelineBuilder.h
diff --git a/src/gpu/GrPipelineBuilder.h b/src/gpu/GrPipelineBuilder.h
index 6a0e137f99bb090eca89020bbba6b5b22dcf7961..87c2bc08bc38eb4abb0faa4b3c86adb5e75e13b3 100644
--- a/src/gpu/GrPipelineBuilder.h
+++ b/src/gpu/GrPipelineBuilder.h
@@ -210,7 +210,7 @@ public:
      * than the color buffer. In is scenario, the higher sample rate is resolved during blending.
      */
     bool hasMixedSamples() const {
-        return this->isHWAntialias() && !fRenderTarget->isMultisampled();
+        return this->isHWAntialias() && !fRenderTarget->isUnifiedMultisampled();
     }
 
     /// @}