use Make instead of Create to return a shared shader

src/core/SkComposeShader.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkComposeShader_DEFINED
@@ skipping 13 matching lines @@
 public:
     /** Create a new compose shader, given shaders A, B, and a combining xfermode mode.
         When the xfermode is called, it will be given the result from shader A as its
         "dst", and the result from shader B as its "src".
         mode->xfer32(sA_result, sB_result, ...)
         @param shaderA  The colors from this shader are seen as the "dst" by the xfermode
         @param shaderB  The colors from this shader are seen as the "src" by the xfermode
         @param mode     The xfermode that combines the colors from the two shaders. If mode
                         is null, then SRC_OVER is assumed.
     */
-    SkComposeShader(SkShader* sA, SkShader* sB, SkXfermode* mode = NULL);
+    SkComposeShader(sk_sp<SkShader> sA, sk_sp<SkShader> sB, SkXfermode* mode = NULL);
     virtual ~SkComposeShader();
 
 #if SK_SUPPORT_GPU
     const GrFragmentProcessor*  asFragmentProcessor(GrContext*,
                                                     const SkMatrix& viewM,
                                                     const SkMatrix* localMatrix,
                                                     SkFilterQuality) const override;
 #endif
 
     class ComposeShaderContext : public SkShader::Context {
@@ skipping 11 matching lines @@
         void shadeSpan(int x, int y, SkPMColor[], int count) override;
 
     private:
         SkShader::Context* fShaderContextA;
         SkShader::Context* fShaderContextB;
 
         typedef SkShader::Context INHERITED;
     };
 
 #ifdef SK_DEBUG
-    SkShader* getShaderA() { return fShaderA; }
-    SkShader* getShaderB() { return fShaderB; }
+    SkShader* getShaderA() { return fShaderA.get(); }
+    SkShader* getShaderB() { return fShaderB.get(); }
 #endif
 
     bool asACompose(ComposeRec* rec) const override;
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkComposeShader)
 
 protected:
     SkComposeShader(SkReadBuffer& );
     void flatten(SkWriteBuffer&) const override;
     size_t onContextSize(const ContextRec&) const override;
     Context* onCreateContext(const ContextRec&, void*) const override;
 
 private:
-    SkShader*   fShaderA;
-    SkShader*   fShaderB;
-    SkXfermode* fMode;
+    sk_sp<SkShader> fShaderA;
+    sk_sp<SkShader> fShaderB;
+    SkXfermode*     fMode;
 
     typedef SkShader INHERITED;
 };
 
 #endif