Add --enable-seccomp-filter-sandbox to about:flags on Android.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 5c8e34a3338354ef207f1ad7f625d3fe41dabc33..7331261b7a1dc4aaa57ec506e38b400006b0d13e 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -2005,6 +2005,15 @@ const Experiment kExperiments[] = {
     kOsAll,
     MULTI_VALUE_TYPE(kSSLVersionMinChoices)
   },
+#if defined(OS_ANDROID)
+  {
+    "enable-seccomp-filter-sandbox",
+    IDS_FLAGS_ENABLE_SECCOMP_FILTER_SANDBOX_ANDROID_NAME,
+    IDS_FLAGS_ENABLE_SECCOMP_FILTER_SANDBOX_ANDROID_DESCRIPTION,
+    kOsAndroid,
+    SINGLE_VALUE_TYPE(switches::kEnableSeccompFilterSandbox)
+  },
+#endif
   // NOTE: Adding new command-line switches requires adding corresponding
   // entries to enum "LoginCustomFlags" in histograms.xml. See note in
   // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.