Add a new mb_config.pyl entry for Cronet Release ASAN bot

This CLs adds an entry in mb_config.pyl for a new Cronet Release Asan bot.

BUG=567323

Review-Url: https://codereview.chromium.org/2143363003
Cr-Commit-Position: refs/heads/master@{#405186}

tools/mb/mb_config.pyl

@@ -29,6 +29,8 @@
       'Android Cronet Builder':
           'android_cronet_gn_release_bot_minimal_symbols',
       'Android Cronet Builder (dbg)': 'android_cronet_gn_debug_static_bot',
+      'Android Cronet Builder Asan':
+          'android_cronet_gn_release_bot_minimal_symbols_clang_asan',
       'Android Cronet Data Reduction Proxy Builder':
           'android_cronet_data_reduction_proxy_gn_release_bot_minimal_symbols',
       'Android Cronet MIPS Builder':
@@ -953,6 +955,11 @@
       'android', 'cronet', 'gn', 'release_bot_minimal_symbols', 'armv6'
     ],
 
+    'android_cronet_gn_release_bot_minimal_symbols_clang_asan': [
+      'android', 'cronet', 'gn', 'release_bot_minimal_symbols', 'arm', 'clang',
+      'asan'
+    ],
+
     'android_cronet_gn_release_bot_minimal_symbols_mipsel': [
       'android', 'cronet', 'gn', 'release_bot_minimal_symbols', 'mipsel'
     ],