Linux Sandbox: split the GPU policies to their own file.

content/common/sandbox_linux/sandbox_bpf_base_policy_linux.cc

Index: content/common/sandbox_linux/sandbox_bpf_base_policy_linux.cc
diff --git a/content/common/sandbox_bpf_base_policy_linux.cc b/content/common/sandbox_linux/sandbox_bpf_base_policy_linux.cc
similarity index 88%
rename from content/common/sandbox_bpf_base_policy_linux.cc
rename to content/common/sandbox_linux/sandbox_bpf_base_policy_linux.cc
index 4341e921fa97344bc471d50fb7e4ea320932b873..d1e5af305631a671f85c7e837a279c842ab151cf 100644
--- a/content/common/sandbox_bpf_base_policy_linux.cc
+++ b/content/common/sandbox_linux/sandbox_bpf_base_policy_linux.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "content/common/sandbox_bpf_base_policy_linux.h"
+#include "content/common/sandbox_linux/sandbox_bpf_base_policy_linux.h"
 
 #include <errno.h>
 
@@ -29,6 +29,10 @@ ErrorCode SandboxBPFBasePolicy::EvaluateSyscall(SandboxBPF* sandbox_compiler,
                                            system_call_number);
 }
 
+bool SandboxBPFBasePolicy::PreSandboxHook() {
+  return true;
+}
+
 int SandboxBPFBasePolicy::GetFSDeniedErrno() {
   return kFSDeniedErrno;
 }