Make GrRenderableConfigForColorSpace argument const

src/gpu/SkGr.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkGr.h"
 #include "SkGrPriv.h"
@@ skipping 490 matching lines @@
             break;
         default:
             return false;
     }
     if (ctOut) {
         *ctOut = ct;
     }
     return true;
 }
 
-GrPixelConfig GrRenderableConfigForColorSpace(SkColorSpace* colorSpace) {
+GrPixelConfig GrRenderableConfigForColorSpace(const SkColorSpace* colorSpace) {
     if (!colorSpace) {
         return kRGBA_8888_GrPixelConfig;
     } else if (colorSpace->gammaIsLinear()) {
         return kRGBA_half_GrPixelConfig;
     } else if (colorSpace->gammaCloseToSRGB()) {
         return kSRGBA_8888_GrPixelConfig;
     } else {
         SkDEBUGFAIL("No renderable config exists for color space with strange gamma");
         return kUnknown_GrPixelConfig;
     }
@@ skipping 265 matching lines @@
             SkErrorInternals::SetError( kInvalidPaint_SkError,
                                         "Sorry, I don't understand the filtering "
                                         "mode you asked for.  Falling back to "
                                         "MIPMaps.");
             textureFilterMode = GrTextureParams::kMipMap_FilterMode;
             break;
 
     }
     return textureFilterMode;
 }