Plumbing mipmaps to the point of creation.

include/core/SkImage.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkImage_DEFINED
 #define SkImage_DEFINED
 
@@ skipping 378 matching lines @@
     /**
      *  Attempt to create a bitmap with the same pixels as the image. The result will always be
      *  a raster-backed bitmap (texture-backed bitmaps are DEPRECATED, and not supported here).
      *
      *  If the mode is kRO (read-only), the resulting bitmap will be marked as immutable.
      *
      *  On succcess, returns true. On failure, returns false and the bitmap parameter will be reset
      *  to empty.
      */
     bool asLegacyBitmap(SkBitmap*, LegacyBitmapMode) const;
-    
+
     /**
      *  Returns true if the image is backed by an image-generator or other src that creates
      *  (and caches) its pixels / texture on-demand.
      */
     bool isLazyGenerated() const;
 
 
 #ifdef SK_SUPPORT_LEGACY_IMAGEFACTORY
     static SkImage* NewRasterCopy(const Info&, const void* pixels, size_t rowBytes,
                                   SkColorTable* ctable = nullptr);
@@ skipping 26 matching lines @@
     static SkImage* NewFromDeferredTextureImageData(GrContext*, const void*, SkBudgeted);
 
     SkImage* newSubset(const SkIRect& subset) const { return this->makeSubset(subset).release(); }
     SkImage* newTextureImage(GrContext* ctx) const { return this->makeTextureImage(ctx).release(); }
 #endif
 
 protected:
     SkImage(int width, int height, uint32_t uniqueID);
 
 private:
+    static sk_sp<SkImage> MakeTextureFromMipMap(GrContext*, const SkImageInfo&,
+                                                const GrMipLevel* texels, int mipLevelCount,
+                                                SkBudgeted);
+
     const int       fWidth;
     const int       fHeight;
     const uint32_t  fUniqueID;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif