Update NetLog to be thread safe.

net/base/capturing_net_log.cc

Index: net/base/capturing_net_log.cc
===================================================================
--- net/base/capturing_net_log.cc	(revision 65207)
+++ net/base/capturing_net_log.cc	(working copy)
@@ -28,21 +28,29 @@
                                const Source& source,
                                EventPhase phase,
                                EventParameters* extra_parameters) {
+  AutoLock lock(lock_);
   Entry entry(type, time, source, phase, extra_parameters);
   if (entries_.size() + 1 < max_num_entries_)
     entries_.push_back(entry);
 }
 
 uint32 CapturingNetLog::NextID() {
-  return next_id_++;
+  return base::subtle::NoBarrier_AtomicIncrement(&next_id_, 1)-1;
 }
 
+void CapturingNetLog::GetEntries(EntryList* entry_list) const {
+  AutoLock lock(lock_);
+  *entry_list = entries_;
+}
+
 void CapturingNetLog::Clear() {
+  AutoLock lock(lock_);
   entries_.clear();
 }
 
-CapturingBoundNetLog::CapturingBoundNetLog(const NetLog::Source& source,
-                                           CapturingNetLog* net_log)
+CapturingBoundNetLog::CapturingBoundNetLog(
+    const NetLog::Source& source,
+    scoped_refptr<CapturingNetLog>& net_log)
     : source_(source), capturing_net_log_(net_log) {
 }
 
@@ -51,13 +59,20 @@
 
 CapturingBoundNetLog::~CapturingBoundNetLog() {}
 
+void CapturingBoundNetLog::GetEntries(
+    CapturingNetLog::EntryList* entry_list) const {
+  capturing_net_log_->GetEntries(entry_list);
+}
+
 void CapturingBoundNetLog::Clear() {
   capturing_net_log_->Clear();
 }
 
 void CapturingBoundNetLog::AppendTo(const BoundNetLog& net_log) const {
-  for (size_t i = 0; i < entries().size(); ++i) {
-    const CapturingNetLog::Entry& entry = entries()[i];
+  CapturingNetLog::EntryList entries;
+  GetEntries(&entries);
+  for (size_t i = 0; i < entries.size(); ++i) {
+    const CapturingNetLog::Entry& entry = entries[i];
     net_log.AddEntryWithTime(entry.type, entry.time, entry.phase,
                              entry.extra_parameters);
   }