Add isUnifiedMultisampled entry point to GrDrawContext

include/gpu/GrDrawContext.h

Index: include/gpu/GrDrawContext.h
diff --git a/include/gpu/GrDrawContext.h b/include/gpu/GrDrawContext.h
index 1ffa987f8a39569e03392101320c562049111a24..fefcb9a4a7fe6e8168796dcd425ae061d822ba8e 100644
--- a/include/gpu/GrDrawContext.h
+++ b/include/gpu/GrDrawContext.h
@@ -261,6 +261,7 @@ public:
     const GrSurfaceDesc& desc() const { return fRenderTarget->desc(); }
     int width() const { return fRenderTarget->width(); }
     int height() const { return fRenderTarget->height(); }
+    bool isUnifiedMultisampled() const { return fRenderTarget->isUnifiedMultisampled(); }
     int numColorSamples() const { return fRenderTarget->numColorSamples(); }
     bool isGammaCorrect() const { return fSurfaceProps.isGammaCorrect(); }