arc: enable Android tracing in verified-boot mode

content/browser/tracing/arc_tracing_agent.h

 // Copyright 2017 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_BROWSER_TRACING_ARC_TRACING_AGENT_H_
 #define CONTENT_BROWSER_TRACING_ARC_TRACING_AGENT_H_
 
 #include "base/callback_forward.h"
+#include "base/files/scoped_file.h"
 #include "base/macros.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/tracing_agent.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 // A wrapper for controlling tracing in ARC container.
 // The overriden Stop/StartAgentTracing functions are implemented by the
 // Delegate object to interact with ARC bridge. All the functions are expected
 // to be called on the browser's UI thread.
 class CONTENT_EXPORT ArcTracingAgent : public base::trace_event::TracingAgent {
  public:
   class Delegate {
    public:
     // Callback for StartTracing, takes one boolean argument to indicate
     // success or failure.
     using StartTracingCallback = base::Callback<void(bool)>;
     // Callback for StopTracing, takes one boolean argument to indicate
     // success or failure.
     using StopTracingCallback = base::Callback<void(bool)>;
 
     virtual ~Delegate();
 
     // Starts tracing in ARC container.
     virtual void StartTracing(
         const base::trace_event::TraceConfig& trace_config,
+        base::ScopedFD write_fd,
         const StartTracingCallback& callback) = 0;
 
     // Stops tracing in ARC container.
     virtual void StopTracing(const StopTracingCallback& callback) = 0;
   };
 
   ArcTracingAgent();
   ~ArcTracingAgent() override;
 
   static ArcTracingAgent* GetInstance();
 
   // Sets Delegate instance, which should implement the communication
   // using ARC bridge. If set to nullptr, calling of Start/StopAgentTracing
   // does nothing. Ownership of |delegate| remains with the caller.
   virtual void SetDelegate(Delegate* delegate) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ArcTracingAgent);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_TRACING_ARC_TRACING_AGENT_H_