MB: Add Mac Asan (swarming) to FYI waterfall.

webrtc/build/mb_config.pyl

 # Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 # FOR DETAILS ON THIS FILE SEE THE MAIN COPY IN //tools/mb/mb_config.pyl.
 # This is configuration for standalone WebRTC bots. It is used to keep the bot
@@ skipping 72 matching lines @@
     'client.webrtc.perf': {
       # Android
       'Android32 Builder': 'android_gn_release_bot_arm',
       'Android64 Builder': 'android_gn_release_bot_arm64',
       'Android32 Tests (L Nexus5)': 'none',
       'Android32 Tests (L Nexus7.2)': 'none',
       'Android64 Tests (L Nexus9)': 'none',
     },
     'client.webrtc.fyi': {
       # Mac
-      'Mac64 Release (swarming)': 'mac_gn_asan_clang_release_bot_x64',
+      'Mac Asan (swarming)': 'mac_gn_asan_clang_release_bot_x64',
 
       # Linux
       'Linux64 GCC': 'gn_gcc_release_bot_x64',
       'Linux Asan (swarming)': 'gn_asan_lsan_clang_release_bot_x64',
       'Linux Memcheck (swarming)': 'gn_memcheck_release_bot_x64',
       'Linux MSan (swarming)': 'gn_msan_clang_release_bot_x64',
       'Linux Tsan v2 (swarming)': 'gn_tsan_clang_release_bot_x64',
       'Linux UBSan (swarming)': 'gn_ubsan_clang_release_bot_x64',
       'Linux UBSan vptr (swarming)': 'gn_ubsan_vptr_clang_release_bot_x64',
 
@@ skipping 428 matching lines @@
       'gn_args': 'target_cpu="x64"',
       'gyp_defines': 'target_arch=x64',
     },
 
     'x86': {
       'gn_args': 'target_cpu="x86"',
       'gyp_defines': 'target_arch=ia32',
     },
   },
 }