Add SkSourceGammaTreatment enum so we know how to create mips

src/core/SkColorShader.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColorShader.h"
 #include "SkColorSpace.h"
 #include "SkReadBuffer.h"
@@ skipping 73 matching lines @@
     }
     return kColor_GradientType;
 }
 
 #if SK_SUPPORT_GPU
 
 #include "SkGr.h"
 #include "effects/GrConstColorProcessor.h"
 const GrFragmentProcessor* SkColorShader::asFragmentProcessor(GrContext*, const SkMatrix&,
                                                               const SkMatrix*,
-                                                              SkFilterQuality) const {
+                                                              SkFilterQuality,
+                                                              SkSourceGammaTreatment) const {
     GrColor color = SkColorToPremulGrColor(fColor);
     return GrConstColorProcessor::Create(color, GrConstColorProcessor::kModulateA_InputMode);
 }
 
 #endif
 
 #ifndef SK_IGNORE_TO_STRING
 void SkColorShader::toString(SkString* str) const {
     str->append("SkColorShader: (");
 
@@ skipping 106 matching lines @@
     }
     return kColor_GradientType;
 }
 
 #if SK_SUPPORT_GPU
 
 #include "SkGr.h"
 #include "effects/GrConstColorProcessor.h"
 const GrFragmentProcessor* SkColor4Shader::asFragmentProcessor(GrContext*, const SkMatrix&,
                                                                const SkMatrix*,
-                                                               SkFilterQuality) const {
+                                                               SkFilterQuality,
+                                                               SkSourceGammaTreatment) const {
     // TODO: how to communicate color4f to Gr
     GrColor color = SkColorToPremulGrColor(fCachedByteColor);
     return GrConstColorProcessor::Create(color, GrConstColorProcessor::kModulateA_InputMode);
 }
 
 #endif
 
 #ifndef SK_IGNORE_TO_STRING
 void SkColor4Shader::toString(SkString* str) const {
     str->append("SkColor4Shader: (");
@@ skipping 72 matching lines @@
 }
 
 bool SkColorShader::ColorShaderContext::onChooseBlitProcs(const SkImageInfo& info,
                                                           BlitState* state) {
     return choose_blitprocs(&fPM4f, info, state);
 }
 
 bool SkColor4Shader::Color4Context::onChooseBlitProcs(const SkImageInfo& info, BlitState* state) {
     return choose_blitprocs(&fPM4f, info, state);
 }