Add SkSourceGammaTreatment enum so we know how to create mips

src/core/SkColorShader.h

 /*
  * Copyright 2007 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkColorShader_DEFINED
 #define SkColorShader_DEFINED
 
@@ skipping 32 matching lines @@
         SkPMColor   fPMColor;
         uint32_t    fFlags;
 
         typedef SkShader::Context INHERITED;
     };
 
     GradientType asAGradient(GradientInfo* info) const override;
 
 #if SK_SUPPORT_GPU
     const GrFragmentProcessor* asFragmentProcessor(GrContext*, const SkMatrix& viewM,
-                                                   const SkMatrix*, SkFilterQuality) const override;
+                                                   const SkMatrix*, SkFilterQuality,
+                                                   SkSourceGammaTreatment) const override;
 #endif
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkColorShader)
 
 protected:
     SkColorShader(SkReadBuffer&);
     void flatten(SkWriteBuffer&) const override;
     Context* onCreateContext(const ContextRec&, void* storage) const override;
     size_t onContextSize(const ContextRec&) const override { return sizeof(ColorShaderContext); }
@@ skipping 33 matching lines @@
         SkPMColor   fPMColor;
         uint32_t    fFlags;
 
         typedef SkShader::Context INHERITED;
     };
 
     GradientType asAGradient(GradientInfo* info) const override;
 
 #if SK_SUPPORT_GPU
     const GrFragmentProcessor* asFragmentProcessor(GrContext*, const SkMatrix& viewM,
-                                                   const SkMatrix*, SkFilterQuality) const override;
+                                                   const SkMatrix*, SkFilterQuality,
+                                                   SkSourceGammaTreatment) const override;
 #endif
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkColorShader)
 
 protected:
     SkColor4Shader(SkReadBuffer&);
     void flatten(SkWriteBuffer&) const override;
     Context* onCreateContext(const ContextRec&, void* storage) const override;
     size_t onContextSize(const ContextRec&) const override { return sizeof(Color4Context); }
     bool onAsLuminanceColor(SkColor* lum) const override {
         *lum = fCachedByteColor;
         return true;
     }
 
 private:
     sk_sp<SkColorSpace> fColorSpace;
     const SkColor4f     fColor4;
     const SkColor       fCachedByteColor;
     
     typedef SkShader INHERITED;
 };
 
 #endif