Add SkSourceGammaTreatment enum so we know how to create mips

src/core/SkLocalMatrixShader.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkLocalMatrixShader_DEFINED
 #define SkLocalMatrixShader_DEFINED
 
 #include "SkShader.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 
 class SkLocalMatrixShader : public SkShader {
 public:
     SkLocalMatrixShader(SkShader* proxy, const SkMatrix& localMatrix)
     : INHERITED(&localMatrix)
     , fProxyShader(SkRef(proxy))
     {}
 
     GradientType asAGradient(GradientInfo* info) const override {
         return fProxyShader->asAGradient(info);
     }
 
 #if SK_SUPPORT_GPU
-    const GrFragmentProcessor* asFragmentProcessor(GrContext* context, const SkMatrix& viewM,
-                                                   const SkMatrix* localMatrix,
-                                                   SkFilterQuality fq) const override {
+    const GrFragmentProcessor* asFragmentProcessor(
+                                            GrContext* context, const SkMatrix& viewM,
+                                            const SkMatrix* localMatrix, SkFilterQuality fq,
+                                            SkSourceGammaTreatment gammaTreatment) const override {
         SkMatrix tmp = this->getLocalMatrix();
         if (localMatrix) {
             tmp.preConcat(*localMatrix);
         }
-        return fProxyShader->asFragmentProcessor(context, viewM, &tmp, fq);
+        return fProxyShader->asFragmentProcessor(context, viewM, &tmp, fq, gammaTreatment);
     }
 #endif
 
     SkShader* refAsALocalMatrixShader(SkMatrix* localMatrix) const override {
         if (localMatrix) {
             *localMatrix = this->getLocalMatrix();
         }
         return SkRef(fProxyShader.get());
     }
 
@@ skipping 12 matching lines @@
         return fProxyShader->isABitmap(bitmap, matrix, mode);
     }
 
 private:
     SkAutoTUnref<SkShader> fProxyShader;
 
     typedef SkShader INHERITED;
 };
 
 #endif