Add an InvariantOutput for the XPF.

include/gpu/GrPaint.h

Index: include/gpu/GrPaint.h
diff --git a/include/gpu/GrPaint.h b/include/gpu/GrPaint.h
index 17bb11811f597b928d762bfa57d089de371d7166..6862d9dc5556e9e423d475e2581be6539df99e94 100644
--- a/include/gpu/GrPaint.h
+++ b/include/gpu/GrPaint.h
@@ -142,15 +142,6 @@ public:
     }
 
     /**
-     * Determines whether the drawing with this paint is opaque with respect to both color blending
-     * and fractional coverage. It does not consider whether AA has been enabled on the paint or
-     * not. Depending upon whether multisampling or coverage-based AA is in use, AA may make the
-     * result only apply to the interior of primitives.
-     *
-     */
-    bool isOpaque() const;
-
-    /**
      * Returns true if isOpaque would return true and the paint represents a solid constant color
      * draw. If the result is true, constantColor will be updated to contain the constant color.
      */
@@ -193,11 +184,6 @@ public:
     }
 
 private:
-    /**
-     * Helper for isOpaque and isOpaqueAndConstantColor.
-     */
-    bool getOpaqueAndKnownColor(GrColor* solidColor, uint32_t* solidColorKnownComponents) const;
-
     friend class GrContext; // To access above two functions
     friend class GrStencilAndCoverTextContext;  // To access above two functions