Always supply a color space (sRGB for now) with F16

bench/nanobench.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.
  */
 
 #include <ctype.h>
 
 #include "nanobench.h"
@@ skipping 448 matching lines @@
                    kUnknown_SkColorType, kUnpremul_SkAlphaType, nullptr)
 
         CPU_CONFIG(8888, kRaster_Backend,
                    kN32_SkColorType, kPremul_SkAlphaType, nullptr)
         CPU_CONFIG(565,  kRaster_Backend,
                    kRGB_565_SkColorType, kOpaque_SkAlphaType, nullptr)
         auto srgbColorSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
         CPU_CONFIG(srgb, kRaster_Backend,
                    kN32_SkColorType,  kPremul_SkAlphaType, srgbColorSpace)
         CPU_CONFIG(f16,  kRaster_Backend,
-                   kRGBA_F16_SkColorType, kPremul_SkAlphaType, nullptr)
+                   kRGBA_F16_SkColorType, kPremul_SkAlphaType, srgbColorSpace)
     }
 
     #undef CPU_CONFIG
 
 #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
     if (config->getTag().equals("hwui")) {
         Config config = { SkString("hwui"), Benchmark::kHWUI_Backend,
                           kRGBA_8888_SkColorType, kPremul_SkAlphaType, nullptr,
                           0, kBogusContextType, kBogusContextOptions, false };
         configs->push_back(config);
@@ skipping 817 matching lines @@
 
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return nanobench_main();
 }
 #endif