Revert 35025 - Revert 34994, maybe it regressed startup perf Fix cpu/memory ...

base/trace_event.cc

Index: base/trace_event.cc
===================================================================
--- base/trace_event.cc	(revision 35042)
+++ base/trace_event.cc	(working copy)
@@ -29,7 +29,14 @@
 
 TraceLog::TraceLog() : enabled_(false), log_file_(NULL) {
   base::ProcessHandle proc = base::GetCurrentProcessHandle();
+#if !defined(OS_MACOSX)
   process_metrics_.reset(base::ProcessMetrics::CreateProcessMetrics(proc));
+#else
+  // The default port provider is sufficient to get data for the current
+  // process.
+  process_metrics_.reset(base::ProcessMetrics::CreateProcessMetrics(proc,
+                                                                    NULL));
+#endif
 }
 
 TraceLog::~TraceLog() {