[MIPS] Add seccomp bpf support

sandbox/linux/sandbox_linux.gypi

Index: sandbox/linux/sandbox_linux.gypi
diff --git a/sandbox/linux/sandbox_linux.gypi b/sandbox/linux/sandbox_linux.gypi
index 35c23641efdbf06203a94bec5250d2f623d5ac00..4684304fb35cceca978ab4558745f7cb750aaa70 100644
--- a/sandbox/linux/sandbox_linux.gypi
+++ b/sandbox/linux/sandbox_linux.gypi
@@ -12,7 +12,8 @@
         'compile_suid_client': 0,
         'compile_credentials': 0,
       }],
-      ['OS=="linux" and (target_arch=="ia32" or target_arch=="x64")', {
+      ['OS=="linux" and (target_arch=="ia32" or target_arch=="x64" or '
+         'target_arch=="mipsel")', {
         'compile_seccomp_bpf_demo': 1,
       }, {
         'compile_seccomp_bpf_demo': 0,
@@ -126,6 +127,8 @@
         'seccomp-bpf/errorcode.cc',
         'seccomp-bpf/errorcode.h',
         'seccomp-bpf/instruction.h',
+        'seccomp-bpf/kernel_return_value_helpers.h',
+        'seccomp-bpf/kernel_return_value_helpers.cc',
         'seccomp-bpf/linux_seccomp.h',
         'seccomp-bpf/sandbox_bpf.cc',
         'seccomp-bpf/sandbox_bpf.h',
@@ -259,7 +262,9 @@
         'services/android_arm_ucontext.h',
         'services/android_ucontext.h',
         'services/android_i386_ucontext.h',
+        'services/android_mips_ucontext.h',
         'services/arm_linux_syscalls.h',
+        'services/mips_linux_syscalls.h',
         'services/linux_syscalls.h',
         'services/x86_32_linux_syscalls.h',
         'services/x86_64_linux_syscalls.h',