respect srgb gamma when building mips

src/core/SkBitmapController.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkBitmapController_DEFINED
 #define SkBitmapController_DEFINED
 
@@ skipping 35 matching lines @@
         return this->requestBitmap(bp, inv, quality, nullptr, 0);
     }
 
 protected:
     virtual State* onRequestBitmap(const SkBitmapProvider&, const SkMatrix& inv, SkFilterQuality,
                                    void* storage, size_t storageSize) = 0;
 };
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
+#include "SkMipMap.h"
+
 class SkDefaultBitmapController : public SkBitmapController {
 public:
-    SkDefaultBitmapController() {}
+    SkDefaultBitmapController(SkSourceGammaTreatment treatment) : fSrcGammaTreatment(treatment) {}
 
 protected:
     State* onRequestBitmap(const SkBitmapProvider&, const SkMatrix& inverse, SkFilterQuality,
                            void* storage, size_t storageSize) override;
+
+private:
+    const SkSourceGammaTreatment fSrcGammaTreatment;
 };
 
 #endif