Revert 133773 - [UMA] Add performance profile data to UMA uploads.

base/tracked_objects.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/tracked_objects.h"
 
 #include <math.h>
 #include <stdlib.h>
 
 #include "base/format_macros.h"
@@ skipping 630 matching lines @@
   base::AutoLock lock(map_lock_);
   for (DeathMap::iterator it = death_map_.begin();
        it != death_map_.end(); ++it)
     it->second.Clear();
   for (BirthMap::iterator it = birth_map_.begin();
        it != birth_map_.end(); ++it)
     it->second->Clear();
 }
 
 static void OptionallyInitializeAlternateTimer() {
-  NowFunction* alternate_time_source = GetAlternateTimeSource();
-  if (alternate_time_source)
-    ThreadData::SetAlternateTimeSource(alternate_time_source);
+  char* alternate_selector = getenv(kAlternateProfilerTime);
+  if (!alternate_selector)
+    return;
+  switch (*alternate_selector) {
+    case '0':  // This is the default value, and uses the wall clock time.
+      break;
+    case '1':  {
+      // Use the TCMalloc allocations-on-thread as a pseudo-time.
+      ThreadData::SetAlternateTimeSource(GetAlternateTimeSource());
+      break;
+      }
+    default:
+      NOTREACHED();
+      break;
+  }
 }
 
 bool ThreadData::Initialize() {
   if (!kTrackAllTaskObjects)
     return false;  // Not compiled in.
   if (status_ >= DEACTIVATED)
     return true;  // Someone else did the initialization.
   // Due to racy lazy initialization in tests, we'll need to recheck status_
   // after we acquire the lock.
 
@@ skipping 196 matching lines @@
     : process_id(base::GetCurrentProcId()) {
 #else
     : process_id(0) {
 #endif
 }
 
 ProcessDataSnapshot::~ProcessDataSnapshot() {
 }
 
 }  // namespace tracked_objects