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..07c358ac621b7b5c2a50f96158009898475f49db 100644
--- a/src/image/SkImage.cpp
+++ b/src/image/SkImage.cpp
@@ -395,6 +395,11 @@ sk_sp<SkImage> SkImage::MakeTextureFromPixmap(GrContext*, const SkPixmap&, SkBud
     return nullptr;
 }
 
+sk_sp<SkImage> MakeTextureFromMipMap(GrContext*, const SkImageInfo&, const GrMipLevel* texels,
+                                     int mipLevelCount, SkBudgeted) {
+    return nullptr;
+}
+
 sk_sp<SkImage> SkImage::MakeFromTexture(GrContext*, const GrBackendTextureDesc&, SkAlphaType,
                                         TextureReleaseProc, ReleaseContext) {
     return nullptr;