Add and use a clang_linux asset.

infra/bots/recipes/swarm_compile.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 
 # Recipe module for Skia Swarming compile.
 
 
 DEPS = [
   'core',
   'recipe_engine/json',
   'recipe_engine/path',
   'recipe_engine/platform',
   'recipe_engine/properties',
   'recipe_engine/python',
   'flavor',
   'run',
   'vars',
 ]
 
 
 TEST_BUILDERS = {
   'client.skia.compile': {
     'skiabot-linux-swarm-000': [
       'Build-Mac-Clang-Arm7-Debug-Android',
       'Build-Mac-Clang-Arm7-Release-iOS',
       'Build-Mac-Clang-mipsel-Debug-GN_Android',
       'Build-Mac-Clang-x86_64-Debug-CommandBuffer',
       'Build-Mac-Clang-x86_64-Release-CMake',
+      'Build-Mac-Clang-x86_64-Release-GN',
       'Build-Ubuntu-Clang-arm64-Release-GN_Android',
       'Build-Ubuntu-Clang-x86_64-Debug-GN',
       'Build-Ubuntu-GCC-Arm7-Debug-Android-Trybot',
       'Build-Ubuntu-GCC-Arm7-Debug-Android_FrameworkDefs',
       'Build-Ubuntu-GCC-Arm7-Debug-Android_NoNeon',
       'Build-Ubuntu-GCC-Arm7-Release-Android',
       'Build-Ubuntu-GCC-Arm7-Release-Android_Vulkan',
       'Build-Ubuntu-GCC-x86-Debug',
       'Build-Ubuntu-GCC-x86_64-Debug-GN',
       'Build-Ubuntu-GCC-x86_64-Debug-MSAN',
@@ skipping 284 matching lines @@
           buildername=buildername + '-Trybot',
           mastername=mastername,
           slavename=slavename,
           buildnumber=5,
           path_config='kitchen',
           swarm_out_dir='[SWARM_OUT_DIR]',
           revision='abc123',
           **gerrit_kwargs) +
       api.platform('win', 64)
   )