Try compiling android with c++14 using MB.

tools_webrtc/mb/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 320 matching lines @@
     # should never actually run MB.
     'none': [
       'error',
     ],
   },
 
   # This is a dict mapping a given 'mixin' name to a dict of settings that
   # mb should use. See //tools/mb/docs/user_guide.md for more information.
   'mixins': {
     'android': {
-      'gn_args': 'target_os="android"',
+      'gn_args': 'target_os="android" use_cxx11=false',
     },
 
     'arm': {
       'gn_args': 'target_cpu="arm"',
     },
 
     'arm64': {
       'gn_args': 'target_cpu="arm64"',
     },
 
@@ skipping 119 matching lines @@
 
     'x86': {
       'gn_args': 'target_cpu="x86"',
     },
 
     'use_default_libcxx': {
       'gn_args': 'use_custom_libcxx=false',
     }
   },
 }