Add SkSourceGammaTreatment enum so we know how to create mips

include/core/SkImageInfo.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkImageInfo_DEFINED
 #define SkImageInfo_DEFINED
 
@@ skipping 158 matching lines @@
 
 ///////////////////////////////////////////////////////////////////////////////
 
 enum SkColorProfileType {
     kLinear_SkColorProfileType,
     kSRGB_SkColorProfileType,
 
     kLastEnum_SkColorProfileType = kSRGB_SkColorProfileType
 };
 
+enum class SkSourceGammaTreatment {
+    kRespect,
+    kIgnore,
+};
+
 /**
  *  Describe an image's dimensions and pixel type.
  *  Used for both src images and render-targets (surfaces).
  */
 struct SK_API SkImageInfo {
 public:
     SkImageInfo()
         : fColorSpace(nullptr)
         , fWidth(0)
         , fHeight(0)
@@ skipping 177 matching lines @@
 
 static inline bool SkColorAndProfileAreGammaCorrect(SkColorType ct, SkColorProfileType pt) {
     return kSRGB_SkColorProfileType == pt || kRGBA_F16_SkColorType == ct;
 }
 
 static inline bool SkImageInfoIsGammaCorrect(const SkImageInfo& info) {
     return SkColorAndProfileAreGammaCorrect(info.colorType(), info.profileType());
 }
 
 #endif