Implement multi-phase build support in MB.

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 91 matching lines @@
       'Chromium Linux Goma Canary (clobber)': 'gn_release_bot',
       'Chromium Linux Precise Goma LinkTest': 'gn_release_bot',
       'Chromium Linux32 Goma Canary (clobber)': 'gn_release_bot_x86',
       'Chromium Mac 10.10 MacViews': 'mac_views_browser_gn_release_bot',
       'Chromium Mac 10.11': 'gn_release_bot',
       'Chromium Mac 10.11 Force Mac Toolchain': 'gn_release_bot',
       'Chromium Mac 10.9 Goma Canary': 'gn_release_bot',
       'Chromium Mac 10.9 Goma Canary (clobber)': 'gn_release_bot',
       'Chromium Mac 10.9 Goma Canary (dbg)': 'gn_debug_bot',
       'Chromium Mac 10.9 Goma Canary (dbg)(clobber)': 'gn_debug_bot',
-      'Chromium Win PGO Builder': 'gyp_official_winpgo',
-      'Chromium Win x64 PGO Builder': 'gyp_official_winpgo_x64',
+      'Chromium Win PGO Builder': [
+        'gyp_official_chrome_pgo_phase_1_x86',
+        'gyp_official_chrome_pgo_phase_2_x86'
+      ],
+      'Chromium Win x64 PGO Builder': [
+        'gyp_official_chrome_pgo_phase_1_x64',
+        'gyp_official_chrome_pgo_phase_2_x64',
+      ],
       'Chromium Windows Analyze': 'gn_windows_analyze',
       'CrWin7Goma': 'gn_release_bot_minimal_symbols_x86',
       'CrWin7Goma(clbr)': 'gn_shared_release_bot_minimal_symbols_x86',
       'CrWin7Goma(dbg)': 'gn_debug_bot_minimal_symbols_x86',
       'CrWin7Goma(dll)': 'gn_shared_release_bot_minimal_symbols_x86',
       'CrWinClang':
         'swarming_gn_clang_official_release_bot_minimal_symbols_x86',
       'CrWinClang(dbg)':
         'swarming_gyp_clang_debug_bot_minimal_symbols_x86',
       'CrWinClang(dbg) tester': 'none',
@@ skipping 493 matching lines @@
 
     'official.desktop': {
       'blimp-engine': '//build/args/bots/official.desktop/blimp-engine.gn',
       'mac64': 'gn_official',
       'precise64': 'gn_official',
 
       # Currently the official bots set mini_installer_official_deps=1
       # but it's not clear if that's actually used anywhere.
       'win': 'gyp_official',
       'win-asan': 'gyp_official_syzyasan',
-      'win-pgo': 'gyp_official_winpgo',
+      'win-pgo': [
+        'gyp_official_chrome_pgo_phase_1_x86',
+        'gyp_official_chrome_pgo_phase_2_x86',
+      ],
       'win64': 'gyp_official_x64',
-      'win64-pgo': 'gyp_official_winpgo_x64',
+      'win64-pgo': [
+        'gyp_official_chrome_pgo_phase_1_x64',
+        'gyp_official_chrome_pgo_phase_2_x64',
+      ],
     },
 
     'official.desktop.continuous': {
       'mac beta': 'gyp_official',
       'mac stable': 'gyp_official',
       'mac trunk': 'gn_official',
       'precise64 beta': 'gn_official',
       'precise64 stable': 'gn_official',
       'precise64 trunk': 'gn_official',
       'win beta': 'gyp_official_six_concurrent_links',
@@ skipping 255 matching lines @@
       'win_chromium_x64_rel_ng': 'swarming_gn_release_trybot_x64',
       'win_clang': 'win_clang_debug_bot',
       'win_clang_dbg': 'swarming_gyp_clang_debug_trybot_x86',
       'win_clang_rel': 'swarming_gyp_clang_official_release_trybot_x86',
       'win_clang_x64_dbg': 'win_clang_debug_bot',
       'win_clang_x64_rel': 'swarming_gyp_clang_official_release_trybot_x64',
       'win_nacl_sdk': 'gyp_release_bot_minimal_symbols_x86',
       'win_nacl_sdk_build': 'gyp_release_bot_minimal_symbols_x86',
       'win_optional_gpu_tests_rel':
         'swarming_gpu_tests_deqp_gles_gn_release_trybot_x86',
-      'win_pgo': 'gyp_official_winpgo',
+      'win_pgo': [
+        'gyp_official_chrome_pgo_phase_1_x86',
+        'gyp_official_chrome_pgo_phase_2_x86',
+      ],
       'win_upload_clang': 'gn_release_bot',
       'win_chrome_official': 'gn_official_goma_minimal_symbols_x86',
       'win_x64_chromium_variable_builder': 'findit',
     },
 
     'tryserver.v8': {
       'v8_android_chromium_gn_dbg': 'android_gn_debug_bot',
       'v8_linux_blink_rel': 'swarming_gn_release_trybot_x64',
       'v8_linux_chromium_gn_rel': 'gn_release_trybot',
     },
@@ skipping 427 matching lines @@
     ],
 
     'gyp_official_syzyasan': [
       'gyp', 'official', 'syzyasan',
     ],
 
     'gyp_official_six_concurrent_links': [
       'gyp', 'official', 'six_concurrent_links',
     ],
 
-    # TODO(crbug.com/595947) - figure out how to handle PGO, which needs
-    # to invoke GYP/GN twice, with two different sets of flags, apparently.
-    'gyp_official_winpgo': [
-      'gyp', 'error',
+    'gyp_official_chrome_pgo_phase_1_x64': [
+      'gyp', 'official', 'chrome_pgo_phase_1', 'x64',
     ],
 
-    'gyp_official_winpgo_x64': [
-      'gyp', 'error', 'x64',
+    'gyp_official_chrome_pgo_phase_2_x64': [
+      'gyp', 'official', 'chrome_pgo_phase_2', 'x64',
+    ],
+
+    'gyp_official_chrome_pgo_phase_1_x86': [
+      'gyp', 'official', 'chrome_pgo_phase_1', 'x86',
+    ],
+
+    'gyp_official_chrome_pgo_phase_2_x86': [
+      'gyp', 'official', 'chrome_pgo_phase_2', 'x86',
     ],
 
     'gyp_official_x64': [
       'gyp', 'official', 'x64',
     ],
 
     'gyp_official_x64_six_concurrent_links': [
       'gyp', 'official', 'x64', 'six_concurrent_links',
     ],
 
@@ skipping 570 matching lines @@
       'gn_args': 'use_cfi_cast=true',
       'gyp_defines': 'cfi_cast=1',
       'mixins': ['cfi'],
     },
 
     'cfi_diag': {
       'gn_args': 'use_cfi_diag=true',
       'gyp_defines': 'cfi_diag=1',
     },
 
+    'chrome_pgo_phase_1': {
+      'gn_args': 'chrome_pgo_phase=1',
+      'gyp_defines': 'chrome_pgo_phase=1',
+    },
+
+    'chrome_pgo_phase_2': {
+      'gn_args': 'chrome_pgo_phase=2',
+      'gyp_defines': 'chrome_pgo_phase=2',
+    },
+
     'chrome_with_codecs': {
       'mixins': ['ffmpeg_branding_chrome', 'proprietary_codecs'],
     },
 
     'chromeos': {
       'gn_args': 'target_os="chromeos"',
       'gyp_defines': 'chromeos=1',
     },
 
     'chromeos_codecs': {
@@ skipping 358 matching lines @@
     },
 
     'drfuzz': { 'gn_args': 'use_drfuzz=true' },
 
     'drmemory': {
       'gn_args': 'is_component_build=true enable_iterator_debugging=false',
       'gyp_defines': 'component=shared_library build_for_tool=drmemory',
     },
   },
 }