Plumbing mipmaps to the point of creation.

src/image/SkImage_Gpu.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkAutoPixmapStorage.h"
 #include "GrCaps.h"
 #include "GrContext.h"
@@ skipping 302 matching lines @@
         return nullptr;
     }
     SkAutoTUnref<GrTexture> texture(GrUploadPixmapToTexture(ctx, pixmap, budgeted));
     if (!texture) {
         return nullptr;
     }
     return sk_make_sp<SkImage_Gpu>(texture->width(), texture->height(), kNeedNewImageUniqueID,
                                    pixmap.alphaType(), texture, budgeted);
 }
 
+sk_sp<SkImage> SkImage::MakeTextureFromMipMap(GrContext* ctx, const SkImageInfo& info,
+                                              const GrMipLevel* texels, int mipLevelCount,
+                                              SkBudgeted budgeted) {
+    if (!ctx) {
+        return nullptr;
+    }
+    SkAutoTUnref<GrTexture> texture(GrUploadMipMapToTexture(ctx, info, texels, mipLevelCount));
+    if (!texture) {
+        return nullptr;
+    }
+    return sk_make_sp<SkImage_Gpu>(texture->width(), texture->height(), kNeedNewImageUniqueID,
+                                   info.alphaType(), texture, budgeted);
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 class DeferredTextureImage {
 public:
     SkImage* newImage(GrContext* context, SkBudgeted) const;
 
 private:
     uint32_t fContextUniqueID;
     struct MipMapLevelData {
         void* fPixelData;
@@ skipping 128 matching lines @@
         return nullptr;
     }
 
     const SkIRect srcR = SkIRect::MakeWH(desc.fWidth, desc.fHeight);
     const SkIPoint dstP = SkIPoint::Make(0, 0);
     ctx->copySurface(dst, src, srcR, dstP);
     ctx->flushSurfaceWrites(dst);
     return dst;
 }