Always use both a color and coverage attribute in GrAARectRenderer.

src/gpu/GrDrawState.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDrawState_DEFINED
 #define GrDrawState_DEFINED
 
@@ skipping 42 matching lines @@
     /**
      * Resets to the default state. GrEffects will be removed from all stages.
      */
     void reset() { this->onReset(NULL); }
 
     void reset(const SkMatrix& initialViewMatrix) { this->onReset(&initialViewMatrix); }
 
     /**
      * 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*);
 
     ///////////////////////////////////////////////////////////////////////////
     /// @name Vertex Attributes
     ////
 
     enum {
         kMaxVertexAttribCnt = kLast_GrVertexAttribBinding + 4,
     };
@@ skipping 765 matching lines @@
      *  @param count      the number of attributes being set, limited to kMaxVertexAttribCnt.
      */
     void setVertexAttribs(const GrVertexAttrib attribs[], int count);
 
     typedef SkRefCnt INHERITED;
 };
 
 GR_MAKE_BITFIELD_OPS(GrDrawState::BlendOptFlags);
 
 #endif