Plumbing mipmaps to the point of creation.

src/image/SkImage.cpp

Index: src/image/SkImage.cpp
diff --git a/src/image/SkImage.cpp b/src/image/SkImage.cpp
index 8bf1f247b07a209d2598b1c7a65b2d52de022525..1c1b311b9381cda6966bf6ca2f3880655a45ef0e 100644
--- a/src/image/SkImage.cpp
+++ b/src/image/SkImage.cpp
@@ -499,3 +499,8 @@ SkImage* SkImage::NewFromDeferredTextureImageData(GrContext* ctx, const void* da
     return MakeFromDeferredTextureImageData(ctx, data, budgeted).release();
 }
 #endif
+
+sk_sp<SkImage> MakeTextureFromMipMap(GrContext*, const SkImageInfo&, const GrMipLevel* texels,
+                                     int mipLevelCount, SkBudgeted) {
+    return nullptr;
+}