Add staging for removal of SkRRectsGaussianEdgeShader::Make (for Android)

src/effects/SkRRectsGaussianEdgeShader.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkRRectsGaussianEdgeShader.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
@@ skipping 391 matching lines @@
 
 SkShader::Context* SkRRectsGaussianEdgeShaderImpl::onCreateContext(const ContextRec& rec,
                                                                    void* storage) const {
     return new (storage) GaussianEdgeShaderContext(*this, rec);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 sk_sp<SkShader> SkRRectsGaussianEdgeShader::Make(const SkRRect& first,
                                                  const SkRRect& second,
-                                                 SkScalar radius) {
+                                                 SkScalar radius, SkScalar unused) {
     if ((!first.isRect()  && !first.isCircle()  && !first.isSimpleCircular()) || 
         (!second.isRect() && !second.isCircle() && !second.isSimpleCircular())) {
         // we only deal with the shapes where the x & y radii are equal 
         // and the same for all four corners
         return nullptr;
     }
 
     return sk_make_sp<SkRRectsGaussianEdgeShaderImpl>(first, second, radius);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkRRectsGaussianEdgeShader)
 SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkRRectsGaussianEdgeShaderImpl)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
 
 ///////////////////////////////////////////////////////////////////////////////