Adjust interfaces to indicate when tracking is in progress

base/profiler/scoped_profile.cc

 // Copyright (c) 2011 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/profiler/scoped_profile.h"
 
 #include "base/location.h"
 #include "base/tracked_objects.h"
 
 
 namespace tracked_objects {
 
 
 ScopedProfile::ScopedProfile(const Location& location)
     : birth_(ThreadData::TallyABirthIfActive(location)),
-      start_of_run_(ThreadData::Now()) {
+      start_of_run_(ThreadData::NowForStartOfRun()) {
 }
 
 ScopedProfile::~ScopedProfile() {
   StopClockAndTally();
 }
 
 void ScopedProfile::StopClockAndTally() {
   if (!birth_)
     return;
   ThreadData::TallyRunInAScopedRegionIfTracking(birth_, start_of_run_,
-                                                ThreadData::Now());
+                                                ThreadData::NowForEndOfRun());
   birth_ = NULL;
 }
 
 }  // namespace tracked_objects