Add SkSourceGammaTreatment enum so we know how to create mips

src/core/SkColorFilterShader.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColorFilterShader.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
@@ skipping 80 matching lines @@
     const SkColorFilterShader& filterShader = static_cast<const SkColorFilterShader&>(fShader);
 
     fShaderContext->shadeSpan4f(x, y, result, count);
     filterShader.fFilter->filterSpan4f(result, count, result);
 }
 
 #if SK_SUPPORT_GPU
 /////////////////////////////////////////////////////////////////////
 
 const GrFragmentProcessor* SkColorFilterShader::asFragmentProcessor(
-                                                               GrContext* context,
-                                                               const SkMatrix& viewM,
-                                                               const SkMatrix* localMatrix,
-                                                               SkFilterQuality fq) const {
+                                                     GrContext* context,
+                                                     const SkMatrix& viewM,
+                                                     const SkMatrix* localMatrix,
+                                                     SkFilterQuality fq,
+                                                     SkSourceGammaTreatment gammaTreatment) const {
 
     SkAutoTUnref<const GrFragmentProcessor> fp1(fShader->asFragmentProcessor(context, viewM,
-                                                                             localMatrix, fq));
+                                                                             localMatrix, fq,
+                                                                             gammaTreatment));
     if (!fp1.get()) {
         return nullptr;
     }
 
     SkAutoTUnref<const GrFragmentProcessor> fp2(fFilter->asFragmentProcessor(context));
     if (!fp2.get()) {
         return fp1.release();
     }
 
     const GrFragmentProcessor* fpSeries[] = { fp1.get(), fp2.get() };
@@ skipping 19 matching lines @@
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 sk_sp<SkShader> SkShader::makeWithColorFilter(sk_sp<SkColorFilter> filter) const {
     SkShader* base = const_cast<SkShader*>(this);
     if (!filter) {
         return sk_ref_sp(base);
     }
     return sk_make_sp<SkColorFilterShader>(sk_ref_sp(base), filter);
 }