Add SkSourceGammaTreatment enum so we know how to create mips

gm/yuvtorgbeffect.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // This test only works with the GPU backend.
 
 #include "gm.h"
@@ skipping 64 matching lines @@
             return;        
         }
 
         GrContext* context = canvas->getGrContext();
         if (!context) {
             return;
         }
 
         SkAutoTUnref<GrTexture> texture[3];
         texture[0].reset(GrRefCachedBitmapTexture(context, fBmp[0],
-                                                  GrTextureParams::ClampBilerp()));
+                                                  GrTextureParams::ClampBilerp(),
+                                                  SkSourceGammaTreatment::kRespect));
         texture[1].reset(GrRefCachedBitmapTexture(context, fBmp[1],
-                                                  GrTextureParams::ClampBilerp()));
+                                                  GrTextureParams::ClampBilerp(),
+                                                  SkSourceGammaTreatment::kRespect));
         texture[2].reset(GrRefCachedBitmapTexture(context, fBmp[2],
-                                                  GrTextureParams::ClampBilerp()));
+                                                  GrTextureParams::ClampBilerp(),
+                                                  SkSourceGammaTreatment::kRespect));
 
         if (!texture[0] || !texture[1] || !texture[2]) {
             return;
         }
 
         static const SkScalar kDrawPad = 10.f;
         static const SkScalar kTestPad = 10.f;
         static const SkScalar kColorSpaceOffset = 36.f;
         SkISize sizes[3] = {{YSIZE, YSIZE}, {USIZE, USIZE}, {VSIZE, VSIZE}};
 
@@ skipping 37 matching lines @@
 private:
     SkBitmap fBmp[3];
 
     typedef GM INHERITED;
 };
 
 DEF_GM(return new YUVtoRGBEffect;)
 }
 
 #endif