respect srgb gamma when building mips

src/core/SkBitmapCache.h

Index: src/core/SkBitmapCache.h
diff --git a/src/core/SkBitmapCache.h b/src/core/SkBitmapCache.h
index 9371e77ca99f337a552c0082371de46c341fae95..1c6b44c59addab4c4011b0d655e2a071a2b2c0aa 100644
--- a/src/core/SkBitmapCache.h
+++ b/src/core/SkBitmapCache.h
@@ -8,12 +8,11 @@
 #ifndef SkBitmapCache_DEFINED
 #define SkBitmapCache_DEFINED
 
-#include "SkScalar.h"
 #include "SkBitmap.h"
+#include "SkMipMap.h"
 
 class SkImage;
 class SkResourceCache;
-class SkMipMap;
 
 uint64_t SkMakeResourceCacheSharedIDForBitmap(uint32_t bitmapGenID);
 
@@ -73,9 +72,10 @@ public:
 
 class SkMipMapCache {
 public:
-    static const SkMipMap* FindAndRef(const SkBitmapCacheDesc&,
+    static const SkMipMap* FindAndRef(const SkBitmapCacheDesc&, SkMipMap::SrcGammaMode,
                                       SkResourceCache* localCache = nullptr);
-    static const SkMipMap* AddAndRef(const SkBitmap& src, SkResourceCache* localCache = nullptr);
+    static const SkMipMap* AddAndRef(const SkBitmap& src, SkMipMap::SrcGammaMode,
+                                     SkResourceCache* localCache = nullptr);
 };
 
 #endif