trace_event support for thread names

base/threading/platform_thread.h

Index: base/threading/platform_thread.h
diff --git a/base/threading/platform_thread.h b/base/threading/platform_thread.h
index 230d2099f7b92ed222333f794334e9f643150d1f..f07bd47e168bc6174313583b072bf7eb6b68fe7d 100644
--- a/base/threading/platform_thread.h
+++ b/base/threading/platform_thread.h
@@ -74,9 +74,14 @@ class BASE_API PlatformThread {
   // Sleeps for the specified duration (units are milliseconds).
   static void Sleep(int duration_ms);
 
-  // Sets the thread name visible to a debugger.  This has no effect otherwise.
+  // Sets the thread name visible to debuggers/tools. This has no effect
+  // otherwise. This name pointer is not copied internally. Thus, it must stay
+  // valid until the thread ends.
   static void SetName(const char* name);
 
+  // Gets the thread name, if previously set by SetName.
+  static const char* GetName();
+
   // Creates a new thread.  The |stack_size| parameter can be 0 to indicate
   // that the default stack size should be used.  Upon success,
   // |*thread_handle| will be assigned a handle to the newly created thread,