Process names, and predictable thread and process ordering in about:tracing

base/debug/trace_event_impl.h

Index: base/debug/trace_event_impl.h
diff --git a/base/debug/trace_event_impl.h b/base/debug/trace_event_impl.h
index a7ebaf2d4d155132f9c3f4e4bb70905e27f42c46..4fe04a1d235a5ffe94bce1c936c8f0fcac89653e 100644
--- a/base/debug/trace_event_impl.h
+++ b/base/debug/trace_event_impl.h
@@ -6,6 +6,7 @@
 #ifndef BASE_DEBUG_TRACE_EVENT_IMPL_H_
 #define BASE_DEBUG_TRACE_EVENT_IMPL_H_
 
+#include <map>
 #include <stack>
 #include <string>
 #include <vector>
@@ -450,6 +451,9 @@ class BASE_EXPORT TraceLog {
   }
 
   void SetProcessID(int process_id);
+  void SetProcessSortIndex(int sort_index);
+  void SetProcessLabel(int label_id, const std::string& current_label);
+  void SetThreadSortIndex(int thread_id, int sort_index);
 
   // Allow setting an offset between the current TimeTicks time and the time
   // that should be reported.
@@ -509,7 +513,7 @@ class BASE_EXPORT TraceLog {
   TraceLog();
   ~TraceLog();
   const unsigned char* GetCategoryGroupEnabledInternal(const char* name);
-  void AddThreadNameMetadataEvents();
+  void AddMetadataEvents();
 
 #if defined(OS_ANDROID)
   void SendToATrace(char phase,
@@ -539,6 +543,10 @@ class BASE_EXPORT TraceLog {
   bool dispatching_to_observer_list_;
   std::vector<EnabledStateObserver*> enabled_state_observer_list_;
 
+  std::map<int, std::string> process_labels_;
+  int process_sort_index_;
+  base::hash_map<int, int> thread_sort_indices_;
+
   base::hash_map<int, std::string> thread_names_;
   base::hash_map<int, std::stack<TimeTicks> > thread_event_start_times_;
   base::hash_map<std::string, int> thread_colors_;