Reduce calls sites where both the GrDrawContext & GrRenderTarget are both passed

include/gpu/GrDrawContext.h

Index: include/gpu/GrDrawContext.h
diff --git a/include/gpu/GrDrawContext.h b/include/gpu/GrDrawContext.h
index 82cf362d5799ecef0899f1b2ba97261cde97ce76..bf6f2a89f3adc8d6ceb34b31289ae2007c1dd212 100644
--- a/include/gpu/GrDrawContext.h
+++ b/include/gpu/GrDrawContext.h
@@ -278,6 +278,8 @@ public:
     int height() const { return fRenderTarget->height(); }
     int numColorSamples() const { return fRenderTarget->numColorSamples(); }
 
+    GrRenderTarget* accessRenderTarget() { return fRenderTarget; }
+
 private:
     friend class GrAtlasTextContext; // for access to drawBatch
     friend class GrDrawingManager; // for ctor