mb_config.pyl: Add win-angle-rel

Bug: 822310
Change-Id: I08253e03f7a7e954b129d7650ca30efcca5fc9cb
Reviewed-on: https://chromium-review.googlesource.com/c/1355603Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613350}

tools/mb/mb_config.pyl

@@ -605,6 +605,7 @@
       'linux_angle_rel_ng': 'gpu_fyi_tests_release_trybot',
       'mac_angle_dbg_ng': 'gpu_fyi_tests_debug_trybot',
       'mac_angle_rel_ng': 'gpu_fyi_tests_release_trybot',
+      'win-angle-rel': 'gpu_fyi_tests_release_trybot_x86',
       'win_angle_dbg_ng': 'gpu_fyi_tests_debug_trybot_x86',
       'win_angle_deqp_rel_ng': 'deqp_release_trybot_x86',
       'win_angle_rel_ng': 'gpu_fyi_tests_release_trybot_x86',