Add new official.desktop Win PGO recipe builder.

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 .pyl, or "Python Literal", file. You can treat it just like a
 # .json file, with the following exceptions:
 # * all keys must be quoted (use single quotes, please);
 # * comments are allowed, using '#' syntax; and
 # * trailing commas are allowed.
 
@@ skipping 435 matching lines @@
       'win-pgo': {
         '1': 'official_chrome_pgo_phase_1_x86',
         '2': 'official_chrome_pgo_phase_2_x86',
       },
       'win64': 'official',
       'win64-clang': 'official_clang',
       'win64-pgo': {
         '1': 'official_chrome_pgo_phase_1',
         '2': 'official_chrome_pgo_phase_2',
       },
+      'win64-pgo-recipes': {

[dimu, 2017/04/03 20:38:52]

TODO that we will delete it after verifying the recipes pinning changes?

+        '1': 'official_chrome_pgo_phase_1',
+        '2': 'official_chrome_pgo_phase_2',
+      },
     },
 
     'official.desktop.continuous': {
       'mac beta': 'official',
       'mac stable': 'official',
       'mac trunk': 'official',
       'precise64 beta': 'official_six_concurrent_links',
       'precise64 stable': 'official_six_concurrent_links',
       'precise64 trunk': 'official_six_concurrent_links',
       'win beta': 'official_six_concurrent_links',
@@ skipping 1462 matching lines @@
 
     'x64': {
       'gn_args': 'target_cpu="x64"',
     },
 
     'x86': {
       'gn_args': 'target_cpu="x86"',
     },
   },
 }