[Android] Define a baseline seccomp-bpf sandbox policy.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 321d96e14e6da3d6a968a0da96a36fdd3f9a8fc7..01e243c9838dcc34430a47ba38964fb813c09a22 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -521,6 +521,11 @@ const char kEnableTargetedStyleRecalc[] =
 // is denied by the sandbox.
 const char kEnableSandboxLogging[]          = "enable-sandbox-logging";
 
+// Enables seccomp-bpf support for Android. Requires experimental kernel
+// support. <http://crbug.com/166704>
+const char kEnableSeccompFilterSandbox[] =
+    "enable-seccomp-filter-sandbox";
+
 // Enables the Skia benchmarking extension
 const char kEnableSkiaBenchmarking[]        = "enable-skia-benchmarking";