wpr_go: support armv7l and aarch64

telemetry/bin/update_wpr_go_binary

 #!/usr/bin/env python
 # Copyright (c) 2017 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.
 
 import os
 import sys
 import subprocess
 import platform
 
@@ skipping 27 matching lines @@
   # go build command recognizes 'amd64' but not 'x86_64', so we switch 'x86_64'
   # to 'amd64' string here.
   # The two names can be used interchangbly, see:
   # https://wiki.debian.org/DebianAMD64Faq?action=recall&rev=65
   if os_arch == 'x86_64' or os_arch == 'AMD64':
     os_arch = 'amd64'
 
   if os_arch == 'x86':
     os_arch = '386'
 
+  if os_arch == 'armv7l':
+    os_arch = 'arm'
+
+  if os_arch == 'aarch64':
+    os_arch = 'arm64'
+
   # go build command recognizes 'darwin' but not 'mac'.
   if os_name == 'mac':
     os_name = 'darwin'
 
   if os_name == 'win':
     os_name = 'windows'
 
   check_go_version()
   env = os.environ.copy()
   env['GOPATH'] = '%s:%s' % (_WPR_GO_DIR, _GO_LIB_DIR)
   env['GOOS'] = os_name
   env['GOARCH'] = os_arch
   env['CGO_ENABLED'] = '0'
 
   build_cmd = ['go', 'build', '-v', os.path.join('src', 'wpr.go')]
   print 'Running build command: %s' % ' '.join(build_cmd)
   subprocess.check_call(build_cmd, env=env, cwd=_WPR_GO_DIR)
   if os_name == 'windows':
     return os.path.join(_WPR_GO_DIR, 'wpr.exe')
   return os.path.join(_WPR_GO_DIR, 'wpr')
 
 
 # TODO(nedn): support building other architectures & OSes.
 _SUPPORTED_PLATFORMS = (
   ('win', 'x86'),
   ('mac', 'x86_64'),
   ('linux', 'x86_64'),
   ('win', 'AMD64'),
+  ('linux', 'armv7l'),
+  ('linux', 'aarch64'),
 )
 
 
 def get_latest_wpr_go_commit_hash():
   return subprocess.check_output(
     ['git', 'log', '-n', '1', '--pretty=format:%H', _WPR_GO_DIR]).strip()
 
 
 def BuildAndUpdateWPRGoBinary(os_name, arch_name):
   if (os_name, arch_name) not in _SUPPORTED_PLATFORMS:
@@ skipping 11 matching lines @@
        os_name=os_name, arch_name=arch_name)
 
 
 def main():
   for os_name, arch_name in _SUPPORTED_PLATFORMS:
     BuildAndUpdateWPRGoBinary(os_name, arch_name)
 
 
 if __name__ == "__main__":
   sys.exit(main())