Add tracing support to NaCl

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/leak_annotations.h"
@@ skipping 609 matching lines @@
                             int threshold_begin_id,
                             long long threshold,
                             unsigned char flags) {
   DCHECK(name);
 
 #if defined(OS_ANDROID)
   SendToATrace(phase, GetCategoryName(category_enabled), name,
                num_args, arg_names, arg_types, arg_values);
 #endif
 
-  TimeTicks now = TimeTicks::NowFromSystemTraceTime();
+  TimeTicks now = TimeTicks::NowFromSystemTraceTime() - time_offset_;
   NotificationHelper notifier(this);
   int ret_begin_id = -1;
   {
     AutoLock lock(lock_);
     if (*category_enabled != CATEGORY_ENABLED)
       return -1;
     if (logged_events_.size() >= kTraceEventBufferSize)
       return -1;
 
     int thread_id = static_cast<int>(PlatformThread::CurrentId());
@@ skipping 156 matching lines @@
 void TraceLog::SetProcessID(int process_id) {
   process_id_ = process_id;
   // 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;
 }
 
+void TraceLog::SetTimeOffset(TimeDelta offset) {
+  time_offset_ = offset;
+}
+
 }  // namespace debug
 }  // namespace base