Use FILE thread for disk operations in TraceSubscriberStdio

base/debug/trace_event_impl.cc

 // 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.
 
 #include "base/debug/trace_event_impl.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
@@ skipping 505 matching lines @@
     return;
 
   for (size_t i = 0;
        i < previous_logged_events.size();
        i += kTraceEventBatchSize) {
     scoped_refptr<RefCountedString> json_events_str_ptr =
         new RefCountedString();
     TraceEvent::AppendEventsAsJSON(previous_logged_events,
                                    i,
                                    kTraceEventBatchSize,
-                                   &(json_events_str_ptr->data));
+                                   &(json_events_str_ptr->data()));
     output_callback_copy.Run(json_events_str_ptr);
   }
 }
 
 int TraceLog::AddTraceEvent(char phase,
                             const unsigned char* category_enabled,
                             const char* name,
                             unsigned long long id,
                             int num_args,
                             const char** arg_names,
@@ skipping 178 matching lines @@
   // Create a FNV hash from the process ID for XORing.
   // See http://isthe.com/chongo/tech/comp/fnv/ for algorithm details.
   unsigned long long offset_basis = 14695981039346656037ull;
   unsigned long long fnv_prime = 1099511628211ull;
   unsigned long long pid = static_cast<unsigned long long>(process_id_);
   process_id_hash_ = (offset_basis ^ pid) * fnv_prime;
 }
 
 }  // namespace debug
 }  // namespace base