Add tests for Headless Linux bot

tools/mb/mb_config.pyl

 # Copyright 2015 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.
 
 {
   # This is a map of buildbot master names -> buildbot builder names ->
   # config names (where each config name is a key in the 'configs' dict,
   # below). MB uses this dict to look up which config to use for a given bot.
   'masters': {
     # Take care when changing any of these builders to ensure that you do not
@@ skipping 184 matching lines @@
       'Windows Tests (DrMemory)': 'tbd',
 
       'CFI Linux CF': 'gn_cfi_diag_release_bot',
       'CFI Linux ToT': 'gn_cfi_release_bot',
       'CFI Linux': 'gn_cfi_release_bot',
       'LTO Linux Perf': 'gn_official_goma_lto',
       'Chromium_iOS_Device': 'ios_gyp',
       'Chromium_iOS_Device_(ninja)': 'ios_gyp',
       'Chromium_iOS_Simulator_(dbg)': 'ios_gyp',
       'CrWinClang64(dbg)': 'win_clang_debug_bot',
+      'Headless Linux (dbg)': 'gn_headless_debug_bot',
       'Libfuzzer Upload Linux ASan': 'gn_release_libfuzzer_asan',
       'Libfuzzer Upload Linux MSan': 'gn_release_libfuzzer_msan',
       'Libfuzzer Upload Linux UBSan': 'gn_release_libfuzzer_ubsan',
       'Linux ARM': 'swarming_gyp_release_bot_arm',
       'Site Isolation Linux': 'gn_release_trybot',
       'Site Isolation Win': 'gyp_release_trybot_x64',
       'Win LKGR (DrM 64)': 'gn_release_drmemory_drfuzz',
       'Win LKGR (DrM)': 'gn_release_drmemory_drfuzz_x86',
     },
 
@@ skipping 895 matching lines @@
     ],
 
     'gyp_release_trybot': [
       'gyp', 'release_trybot',
     ],
 
     'gyp_release_trybot_x64': [
       'gyp', 'release_trybot', 'x64',
     ],
 
+    'gn_headless_debug_bot': [
+      'gn', 'headless', 'debug_bot',
+    ],
+
     'gn_release_libfuzzer_asan': [
       'gn', 'release', 'libfuzzer', 'asan', 'proprietary_codecs', 'pdf_xfa',
       'disable_nacl',
     ],
 
     'gn_release_libfuzzer_msan': [
       'gn', 'release', 'libfuzzer', 'msan', 'proprietary_codecs', 'pdf_xfa',
       'disable_nacl',
     ],
     'gn_release_libfuzzer_ubsan': [
-      'gn', 'release', 'libfuzzer', 'ubsan_security', 'proprietary_codecs', 
+      'gn', 'release', 'libfuzzer', 'ubsan_security', 'proprietary_codecs',
       'pdf_xfa', 'disable_nacl',
     ],
 
     'gn_release_drmemory_drfuzz_x86': [
       'gn', 'release', 'drmemory', 'drfuzz', 'x86', 'proprietary_codecs',
      ],
     'gn_release_drmemory_drfuzz': [
       'gn', 'release', 'drmemory', 'drfuzz', 'proprietary_codecs',
     ],
 
     'gyp_valgrind_release_bot': [
       'gyp', 'valgrind', 'release_bot',
     ],
 
     'gyp_valgrind_chromeos_release_bot': [
       'gyp', 'chromeos', 'valgrind', 'release_bot',
     ],
 
     'gyp_windows_analyze': [
-      'gyp', 'no_symbols', 'disable_precompiled_headers', 
+      'gyp', 'no_symbols', 'disable_precompiled_headers',
       'shared', 'x86', 'win_analyze',
     ],
 
     'gyp_drmemory_shared_release_x86': [
       'gyp', 'drmemory', 'shared', 'release', 'x86',
     ],
 
     'gyp_drmemory_shared_release_x64': [
       'gyp', 'drmemory', 'shared', 'release', 'x64',
     ],
@@ skipping 457 matching lines @@
       'gn_args': 'use_goma=true goma_dir="$(goma_dir)"',
       'gyp_defines': 'use_goma=1 gomadir=$(goma_dir)',
     },
 
     'gpu_tests': {
       'mixins': ['archive_gpu_tests', 'chrome_with_codecs'],
     },
 
     'gyp': {'type': 'gyp'},
 
+    # TODO(skyostil): Consider replacing the 'is_headless' flag with a
+    # //build/args config template.
+    'headless': {
+      'gn_args': 'is_headless=true',
+
+      # It's an error to combine this with the gyp mixin.

[Dirk Pranke, 2016/03/31 01:50:18]

Nit: I would probably change this comment to "# headless is GN-only".

[perezju, 2016/04/07 13:19:31]

Done.

+      'gyp_defines': 'target_arch=unknown',
+    },
+
     'internal_gles2_conform_tests': {
       'gn_args': 'internal_gles2_conform_tests=true',
       'gyp_defines': 'internal_gles2_conform_tests=1',
     },
 
     'libfuzzer': { 'gn_args': 'use_libfuzzer=true' },
 
     'ubsan_security': { 'gn_args': 'is_ubsan_security=true' },
 
     'lsan': {
@@ skipping 128 matching lines @@
       'gn_args': 'is_component_build=true enable_iterator_debugging=false',
       'gyp_defines': 'component=shared_library build_for_tool=drmemory',
     },
 
     'valgrind': {
       # TODO: add gn_args for 'build_for_tool=memcheck'
       'gyp_defines': 'build_for_tool=memcheck',
     }
   },
 }