Pass FROM_HERE to ObserverListThreadSafe::Notify to improve profile.

base/memory/memory_pressure_listener.cc

 // Copyright 2013 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/memory/memory_pressure_listener.h"
 
 #include "base/lazy_instance.h"
 #include "base/observer_list_threadsafe.h"
 #include "base/trace_event/trace_event.h"
 
@@ skipping 36 matching lines @@
 void MemoryPressureListener::Notify(MemoryPressureLevel memory_pressure_level) {
   callback_.Run(memory_pressure_level);
 }
 
 // static
 void MemoryPressureListener::NotifyMemoryPressure(
     MemoryPressureLevel memory_pressure_level) {
   DCHECK_NE(memory_pressure_level, MEMORY_PRESSURE_LEVEL_NONE);
   TRACE_EVENT1("memory", "MemoryPressureListener::NotifyMemoryPressure",
       "level", memory_pressure_level);
-  g_observers.Get().Notify(&MemoryPressureListener::Notify,
+  g_observers.Get().Notify(FROM_HERE, &MemoryPressureListener::Notify,
                            memory_pressure_level);
 }
 
 }  // namespace base