Removed requirement for the renderer to know it's process ID

ui/events/latency_info.h

Index: ui/events/latency_info.h
diff --git a/ui/events/latency_info.h b/ui/events/latency_info.h
index 3e50cc4f80c127b917513b65a07ebf7d29ab5571..6a55663b40ad39f824a73775065c55405d929255 100644
--- a/ui/events/latency_info.h
+++ b/ui/events/latency_info.h
@@ -9,6 +9,7 @@
 #include <utility>
 
 #include "base/basictypes.h"
+#include "base/process/process_handle.h"
 #include "base/time/time.h"
 #include "ui/events/events_base_export.h"
 
@@ -123,6 +124,15 @@ struct EVENTS_BASE_EXPORT LatencyInfo {
   // Records the |event_type| in trace buffer as TRACE_EVENT_ASYNC_STEP.
   void TraceEventType(const char* event_type);
 
+  static void AnnotateWithProcessId(std::vector<ui::LatencyInfo>& latency_info,
+                                    base::ProcessId process_id);

[jamesr, 2014/01/16 23:07:21]

nit: i don't think that the ID used here is actually a PID

+
+  // Some LatencyComponents generated in the renderer, specifically
+  // WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENTs, require a ProcessId to route
+  // notifications correctly. Since that cannot be given in the renderer
+  // this function patches the ProcessId in from the browser process.
+  void AnnotateComponentsWithProcessId(base::ProcessId process_id);
+
   LatencyMap latency_components;
   // The unique id for matching the ASYNC_BEGIN/END trace event.
   int64 trace_id;