add Make variations to return SkImage by sk_sp

include/core/SkShader.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 SkShader_DEFINED
 #define SkShader_DEFINED
 
@@ skipping 386 matching lines @@
      *              successfully creating a picture shader.
      *  @param tmx  The tiling mode to use when sampling the bitmap in the x-direction.
      *  @param tmy  The tiling mode to use when sampling the bitmap in the y-direction.
      *  @param tile The tile rectangle in picture coordinates: this represents the subset
      *              (or superset) of the picture used when building a tile. It is not
      *              affected by localMatrix and does not imply scaling (only translation
      *              and cropping). If null, the tile rect is considered equal to the picture
      *              bounds.
      *  @return     Returns a new shader object. Note: this function never returns null.
     */
-    static sk_sp<SkShader> MakePictureShader(sk_sp<const SkPicture> src, TileMode tmx, TileMode tmy,
+    static sk_sp<SkShader> MakePictureShader(sk_sp<SkPicture> src, TileMode tmx, TileMode tmy,
                                              const SkMatrix* localMatrix, const SkRect* tile);
 
     /**
      *  If this shader can be represented by another shader + a localMatrix, return that shader
      *  and, if not NULL, the localMatrix. If not, return NULL and ignore the localMatrix parameter.
      *
      *  Note: the returned shader (if not NULL) will have been ref'd, and it is the responsibility
      *  of the caller to balance that with unref() when they are done.
      */
     virtual SkShader* refAsALocalMatrixShader(SkMatrix* localMatrix) const;
@@ skipping 32 matching lines @@
     SkMatrix fLocalMatrix;
 
     // So the SkLocalMatrixShader can whack fLocalMatrix in its SkReadBuffer constructor.
     friend class SkLocalMatrixShader;
     friend class SkBitmapProcShader;    // for computeTotalInverse()
 
     typedef SkFlattenable INHERITED;
 };
 
 #endif