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 36c17ba91e3639c8e508a32bd764db12146d0f84..9d5e41240775594f96cf89000852ff9a3bc5445e 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 +26,11 @@ public:
     };
 
     bool extractLevel(SkScalar scale, Level*) const;
+    int getLevelsCount() const;
+    // getLevel() is 1-indexed because the SkMipMap contains the generated
+    // mipmaps, which does not include the base level (which is normally
+    // mipmap level 0). SkMipMap contains mipmap levels 1-x, not 0-x.
+    bool getLevel(int levelIndex, Level* levelPtr) const;
 
 protected:
     void onDataChange(void* oldData, void* newData) override {