Creating functions for uploading a mipmapped texture.

src/core/SkMipMap.h

Index: src/core/SkMipMap.h
diff --git a/src/core/SkMipMap.h b/src/core/SkMipMap.h
index e22c0a2181a9c0fcb41d8c857037570c6d8bc7d7..0f5d254bcd2b9a032a8afbf0b85e0b78cd721b9a 100644
--- a/src/core/SkMipMap.h
+++ b/src/core/SkMipMap.h
@@ -10,11 +10,9 @@
 
 #include "SkCachedData.h"
 #include "SkScalar.h"
+#include "SkMipMapLevel.h"
 
 class SkBitmap;
-class SkDiscardableMemory;
-
-typedef SkDiscardableMemory* (*SkDiscardableFactoryProc)(size_t bytes);
 
 class SkMipMap : public SkCachedData {
 public:
@@ -28,6 +26,8 @@ public:
     };
 
     bool extractLevel(SkScalar scale, Level*) const;
+    int getLevelsCount() const;
+    bool getLevel(int levelIndex, Level* levelPtr) const;
 
 protected:
     void onDataChange(void* oldData, void* newData) override {