Properly lock access to static variables....

base/message_loop.cc

 // Copyright (c) 2010 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/message_loop.h"
 
 #include <algorithm>
 
 #include "base/compiler_specific.h"
 #include "base/lazy_instance.h"
@@ skipping 621 matching lines @@
 // Method and data for histogramming events and actions taken by each instance
 // on each thread.
 
 // static
 void MessageLoop::EnableHistogrammer(bool enable) {
   enable_histogrammer_ = enable;
 }
 
 void MessageLoop::StartHistogrammer() {
   if (enable_histogrammer_ && !message_histogram_.get()
-      && base::StatisticsRecorder::WasStarted()) {
+      && base::StatisticsRecorder::IsActive()) {
     DCHECK(!thread_name_.empty());
     message_histogram_ = base::LinearHistogram::FactoryGet(
         "MsgLoop:" + thread_name_,
         kLeastNonZeroMessageId, kMaxMessageId,
         kNumberOfDistinctMessagesDisplayed,
         message_histogram_->kHexRangePrintingFlag);
     message_histogram_->SetRangeDescriptions(event_descriptions_);
   }
 }
 
@@ skipping 49 matching lines @@
                                            Watcher *delegate) {
   return pump_libevent()->WatchFileDescriptor(
       fd,
       persistent,
       static_cast<base::MessagePumpLibevent::Mode>(mode),
       controller,
       delegate);
 }
 
 #endif