Clarify the process title of GPU broker process.

content/common/sandbox_linux/bpf_gpu_policy_linux.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_SANDBOX_LINUX_BPF_GPU_POLICY_LINUX_H_
 #define CONTENT_COMMON_SANDBOX_LINUX_BPF_GPU_POLICY_LINUX_H_
 
 #include <string>
 #include <vector>
 
+#include "base/callback_forward.h"
 #include "content/common/sandbox_linux/sandbox_bpf_base_policy_linux.h"
 
 namespace sandbox {
 class BrokerProcess;
 }
 
 namespace content {
 
 class GpuProcessPolicy : public SandboxBPFBasePolicy {
  public:
   GpuProcessPolicy();
   virtual ~GpuProcessPolicy();
 
   virtual ErrorCode EvaluateSyscall(SandboxBPF* sandbox_compiler,
                                     int system_call_number) const OVERRIDE;
 
   virtual bool PreSandboxHook() OVERRIDE;
 
  protected:
   // Start a broker process to handle open() inside the sandbox.
   // |broker_sandboxer_callback| is a callback that will enable a suitable
   // sandbox for the broker process itself.
   // |read_whitelist_extra| and |write_whitelist_extra| are lists of file
   // names that should be whitelisted by the broker process, in addition to
   // the basic ones.
   void InitGpuBrokerProcess(
-      bool (*broker_sandboxer_callback)(void),
+      const base::Callback<bool(void)>& broker_sandboxer_callback,
       const std::vector<std::string>& read_whitelist_extra,
       const std::vector<std::string>& write_whitelist_extra);
 
   sandbox::BrokerProcess* broker_process() { return broker_process_; }
 
  private:
   // A BrokerProcess is a helper that is started before the sandbox is engaged
   // and will serve requests to access files over an IPC channel. The client of
   // this runs from a SIGSYS handler triggered by the seccomp-bpf sandbox.
   // This should never be destroyed, as after the sandbox is started it is
   // vital to the process.
   // This is allocated by InitGpuBrokerProcess, called from PreSandboxHook(),
   // which executes iff the sandbox is going to be enabled afterwards.
   sandbox::BrokerProcess* broker_process_;
   DISALLOW_COPY_AND_ASSIGN(GpuProcessPolicy);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_SANDBOX_LINUX_BPF_GPU_POLICY_LINUX_H_