trace_event support for thread names

base/threading/platform_thread_win.cc

Index: base/threading/platform_thread_win.cc
diff --git a/base/threading/platform_thread_win.cc b/base/threading/platform_thread_win.cc
index 56d73811c0fc5fd63e0f6d76a606306d4ad4669b..e2d90d8eccce67674247cecdfd8b9dac7224844c 100644
--- a/base/threading/platform_thread_win.cc
+++ b/base/threading/platform_thread_win.cc
@@ -5,13 +5,17 @@
 #include "base/threading/platform_thread.h"
 
 #include "base/logging.h"
+#include "base/threading/thread_local.h"
 #include "base/threading/thread_restrictions.h"
+
 #include "base/win/windows_version.h"
 
 namespace base {
 
 namespace {
 
+static ThreadLocalPointer<char> current_thread_name;
+
 // The information on how to set the thread name comes from
 // a MSDN article: http://msdn2.microsoft.com/en-us/library/xcb2z8hs.aspx
 const DWORD kVCThreadNameException = 0x406D1388;
@@ -94,6 +98,8 @@ void PlatformThread::Sleep(int duration_ms) {
 
 // static
 void PlatformThread::SetName(const char* name) {
+  current_thread_name.Set(const_cast<char*>(name));
+
   // The debugger needs to be around to catch the name in the exception.  If
   // there isn't a debugger, we are just needlessly throwing an exception.
   if (!::IsDebuggerPresent())
@@ -113,6 +119,11 @@ void PlatformThread::SetName(const char* name) {
 }
 
 // static
+const char* PlatformThread::GetName() {
+  return current_thread_name.Get();
+}
+
+// static
 bool PlatformThread::Create(size_t stack_size, Delegate* delegate,
                             PlatformThreadHandle* thread_handle) {
   DCHECK(thread_handle);