Always use both a color and coverage attribute in GrAARectRenderer.

src/gpu/GrDrawState.h

Index: src/gpu/GrDrawState.h
diff --git a/src/gpu/GrDrawState.h b/src/gpu/GrDrawState.h
index fa4d5b03f534e108879757e7f5644e86df5c3ca1..249eeebe25aa6229fc9a271896e5dfe26e4f45fb 100644
--- a/src/gpu/GrDrawState.h
+++ b/src/gpu/GrDrawState.h
@@ -60,7 +60,8 @@ public:
     /**
      * Initializes the GrDrawState based on a GrPaint, view matrix and render target. Note that
      * GrDrawState encompasses more than GrPaint. Aspects of GrDrawState that have no GrPaint
-     * equivalents are set to default values. Clipping will be enabled.
+     * equivalents are set to default values with the exception of vertex attribute state which
+     * is unmodified by this function and clipping which will be enabled.
      */
     void setFromPaint(const GrPaint& , const SkMatrix& viewMatrix, GrRenderTarget*);