Move clip mask generation into GrReducedClip

src/gpu/GrContextPriv.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrContextPriv_DEFINED
 #define GrContextPriv_DEFINED
 
 #include "GrContext.h"
 
 /** Class that adds methods to GrContext that are only intended for use internal to Skia.
     This class is purely a privileged window into GrContext. It should never have additional
     data members or virtual methods. */
 class GrContextPriv {
 public:
+    GrDrawingManager* drawingManager() { return fContext->fDrawingManager; }
+
     // Create a drawContext that wraps an existing renderTarget
     sk_sp<GrDrawContext> makeWrappedDrawContext(sk_sp<GrRenderTarget> rt,
                                                 sk_sp<SkColorSpace> colorSpace,
                                                 const SkSurfaceProps* = nullptr);
 
     sk_sp<GrDrawContext> makeBackendTextureDrawContext(const GrBackendTextureDesc& desc,
                                                        sk_sp<SkColorSpace> colorSpace,
                                                        const SkSurfaceProps* = nullptr,
                                                        GrWrapOwnership = kBorrow_GrWrapOwnership);
 
@@ skipping 20 matching lines @@
     friend class GrContext; // to construct/copy this type.
 };
 
 inline GrContextPriv GrContext::contextPriv() { return GrContextPriv(this); }
 
 inline const GrContextPriv GrContext::contextPriv () const {
     return GrContextPriv(const_cast<GrContext*>(this));
 }
 
 #endif