respect srgb gamma when building mips

src/core/SkBitmapCache.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #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);
 
 void SkNotifyBitmapGenIDIsStale(uint32_t bitmapGenID);
 
 struct SkBitmapCacheDesc {
     uint32_t    fImageID;
     int32_t     fWidth;
     int32_t     fHeight;
     SkIRect     fBounds;
@@ skipping 39 matching lines @@
     static bool Add(SkPixelRef*, const SkIRect& subset, const SkBitmap& result,
                     SkResourceCache* localCache = nullptr);
 
     static bool Find(uint32_t genID, SkBitmap* result, SkResourceCache* localCache = nullptr);
     // todo: eliminate the need to specify ID, since it should == the bitmap's
     static void Add(uint32_t genID, const SkBitmap&, SkResourceCache* localCache = nullptr);
 };
 
 class SkMipMapCache {
 public:
-    static const SkMipMap* FindAndRef(const SkBitmapCacheDesc&,
+    static const SkMipMap* FindAndRef(const SkBitmapCacheDesc&, SkSourceGammaTreatment,
                                       SkResourceCache* localCache = nullptr);
-    static const SkMipMap* AddAndRef(const SkBitmap& src, SkResourceCache* localCache = nullptr);
+    static const SkMipMap* AddAndRef(const SkBitmap& src, SkSourceGammaTreatment,
+                                     SkResourceCache* localCache = nullptr);
 };
 
 #endif