sandbox: Add Arm64 support for seccomp-BPF

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index a82d24dd2247e7608cd8c8c14697da9023f8e9c3..d5d5a5960c02e9602d9f23ee3c5ab6f2aa6fe43c 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -2297,13 +2297,14 @@
         'host_cxx': '<!(which g++)',
       }],
 
-      # The seccomp-bpf sandbox is only supported on four architectures
+      # The seccomp-bpf sandbox is only supported on five architectures
       # currently.
       # Do not disable seccomp_bpf anywhere without talking to
       # security@chromium.org!
       ['((OS=="linux" or OS=="android") and '
            '(target_arch=="ia32" or target_arch=="x64" or '
-             'target_arch=="arm" or target_arch=="mipsel"))', {
+             'target_arch=="arm" or target_arch=="mipsel" or '
+             'target_arch=="arm64"))', {
          'use_seccomp_bpf%': 1,
       }, {
          'use_seccomp_bpf%': 0,