Move clip mask generation into GrReducedClip

src/gpu/GrReducedClip.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 GrReducedClip_DEFINED
 #define GrReducedClip_DEFINED
 
 #include "SkClipStack.h"
 #include "SkTLList.h"
 
+class GrContext;
+class GrDrawContext;
+
 /**
  * This class takes a clip stack and produces a reduced set of elements that are equivalent to
  * applying that full stack within a specified query rectangle.
  */
 class SK_API GrReducedClip {
 public:
     GrReducedClip(const SkClipStack& stack, const SkRect& queryBounds);
 
     /**
      * If hasIBounds() is true, this is the bounding box within which the reduced clip is valid, and
@@ skipping 29 matching lines @@
      */
     bool requiresAA() const { return fRequiresAA; }
 
     enum class InitialState : bool {
         kAllIn,
         kAllOut
     };
 
     InitialState initialState() const { return fInitialState; }
 
+    bool drawAlphaClipMask(GrDrawContext*) const;
+    bool drawStencilClipMask(GrContext*, GrDrawContext*, const SkIPoint& clipOrigin) const;
+
 private:
     void walkStack(const SkClipStack&, const SkRect& queryBounds);
     bool intersectIBounds(const SkIRect&);
 
     SkIRect        fIBounds;
     bool           fHasIBounds;
     ElementList    fElements;
     int32_t        fElementsGenID;
     bool           fRequiresAA;
     InitialState   fInitialState;
 };
 
 #endif