[tracing] Send smaps file desciptor to child process for tracing

components/tracing/child_trace_message_filter.h

 // Copyright (c) 2012 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 COMPONENTS_TRACING_CHILD_TRACE_MESSAGE_FILTER_H_
 #define COMPONENTS_TRACING_CHILD_TRACE_MESSAGE_FILTER_H_
 
 #include "base/bind.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
 #include "base/trace_event/memory_dump_request_args.h"
+#include "components/tracing/child_memory_dump_manager_delegate_impl.h"
 #include "components/tracing/tracing_export.h"
+#include "ipc/ipc_platform_file.h"
 #include "ipc/message_filter.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace tracing {
 
 // This class sends and receives trace messages on child processes.
 class TRACING_EXPORT ChildTraceMessageFilter : public IPC::MessageFilter {
@@ skipping 14 matching lines @@
     return ipc_task_runner_;
   }
 
  protected:
   ~ChildTraceMessageFilter() override;
 
  private:
   // Message handlers.
   void OnBeginTracing(const std::string& trace_config_str,
                       base::TraceTicks browser_time,
-                      uint64 tracing_process_id);
+                      TracingMsg_MemoryTracingInfo memory_tracing_info);
   void OnEndTracing();
   void OnCancelTracing();
   void OnEnableMonitoring(const std::string& trace_config_str,
                           base::TraceTicks browser_time);
   void OnDisableMonitoring();
   void OnCaptureMonitoringSnapshot();
   void OnGetTraceLogStatus();
   void OnSetWatchEvent(const std::string& category_name,
                        const std::string& event_name);
   void OnCancelWatchEvent();
@@ skipping 33 matching lines @@
   base::trace_event::MemoryDumpCallback pending_memory_dump_callback_;
 
   base::Time histogram_last_changed_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildTraceMessageFilter);
 };
 
 }  // namespace tracing
 
 #endif  // COMPONENTS_TRACING_CHILD_TRACE_MESSAGE_FILTER_H_