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

content/common/sandbox_linux/sandbox_bpf_base_policy_linux.h

Index: content/common/sandbox_linux/sandbox_bpf_base_policy_linux.h
diff --git a/content/common/sandbox_bpf_base_policy_linux.h b/content/common/sandbox_linux/sandbox_bpf_base_policy_linux.h
similarity index 68%
rename from content/common/sandbox_bpf_base_policy_linux.h
rename to content/common/sandbox_linux/sandbox_bpf_base_policy_linux.h
index 8edba1dd37910adb05de734217170020a30cb2d9..6d9d83f4fa1f81827085e87df28f05a3fd9184cb 100644
--- a/content/common/sandbox_bpf_base_policy_linux.h
+++ b/content/common/sandbox_linux/sandbox_bpf_base_policy_linux.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CONTENT_COMMON_SANDBOX_BPF_BASE_POLICY_LINUX_H_
-#define CONTENT_COMMON_SANDBOX_BPF_BASE_POLICY_LINUX_H_
+#ifndef CONTENT_COMMON_SANDBOX_LINUX_SANDBOX_BPF_BASE_POLICY_LINUX_H_
+#define CONTENT_COMMON_SANDBOX_LINUX_SANDBOX_BPF_BASE_POLICY_LINUX_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
@@ -26,6 +26,15 @@ class SandboxBPFBasePolicy : public sandbox::SandboxBPFPolicy {
 
   virtual ErrorCode EvaluateSyscall(SandboxBPF* sandbox_compiler,
                                     int system_call_number) const OVERRIDE;
+
+  // A policy can implement this hook to run code right before the policy
+  // is passed to the SandboxBPF class and the sandbox is engaged.
+  // If PreSandboxHook() returns true, the sandbox is guaranteed to be
+  // engaged afterwards.
+  // This will be used when enabling the sandbox though
+  // SandboxSeccompBPF::StartSandbox().
+  virtual bool PreSandboxHook();
+
   // Get the errno(3) to return for filesystem errors.
   static int GetFSDeniedErrno();
 
@@ -37,4 +46,4 @@ class SandboxBPFBasePolicy : public sandbox::SandboxBPFPolicy {
 
 }  // namespace content
 
-#endif  // CONTENT_COMMON_SANDBOX_BPF_BASE_POLICY_LINUX_H_
+#endif  // CONTENT_COMMON_SANDBOX_LINUX_SANDBOX_BPF_BASE_POLICY_LINUX_H_