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

tools/flags/SkCommonFlagsConfig.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCommonFlagsConfig.h"
 
 #include <stdlib.h>
@@ skipping 266 matching lines @@
 static bool parse_option_gpu_color(const SkString& value,
                                    SkColorType* outColorType,
                                    sk_sp<SkColorSpace>* outColorSpace) {
     if (value.equals("8888")) {
         *outColorType = kN32_SkColorType;
         *outColorSpace = nullptr;
         return true;
     }
     if (value.equals("f16")) {
         *outColorType = kRGBA_F16_SkColorType;
-        *outColorSpace = nullptr;
+        *outColorSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
         return true;
     }
     if (value.equals("srgb")) {
         *outColorType = kN32_SkColorType;
         *outColorSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
         return true;
     }
     return false;
 }
 
@@ skipping 104 matching lines @@
         if (extendedBackend.equals("gpu")) {
             parsedConfig = parse_command_line_config_gpu(tag, vias, extendedOptions);
         }
 #endif
         if (!parsedConfig) {
             parsedConfig = new SkCommandLineConfig(tag, simpleBackend, vias);
         }
         outResult->emplace_back(parsedConfig);
     }
 }