cros: Log per-process memory use on low memory events

chrome/browser/metrics/metrics_service.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.
 
 //------------------------------------------------------------------------------
 // Description of the life cycle of a instance of MetricsService.
 //
 //  OVERVIEW
 //
 // A MetricsService instance is typically created at application startup.  It
@@ skipping 909 matching lines @@
   // then call OnHistogramSynchronizationDone to continue processing.
   DCHECK(!waiting_for_asynchronus_reporting_step_);
   waiting_for_asynchronus_reporting_step_ = true;
 
   base::Closure callback =
       base::Bind(&MetricsService::OnMemoryDetailCollectionDone,
                  self_ptr_factory_.GetWeakPtr());
 
   scoped_refptr<MetricsMemoryDetails> details(
       new MetricsMemoryDetails(callback));
-  details->StartFetch();
+  details->StartFetch(MemoryDetails::UPDATE_USER_METRICS);
 
   // Collect WebCore cache information to put into a histogram.
   for (content::RenderProcessHost::iterator i(
           content::RenderProcessHost::AllHostsIterator());
        !i.IsAtEnd(); i.Advance())
     i.GetCurrentValue()->Send(new ChromeViewMsg_GetCacheResourceStats());
 }
 
 void MetricsService::OnMemoryDetailCollectionDone() {
   DCHECK(IsSingleThreaded());
@@ skipping 729 matching lines @@
   if (local_state) {
     const PrefService::Preference* uma_pref =
         local_state->FindPreference(prefs::kMetricsReportingEnabled);
     if (uma_pref) {
       bool success = uma_pref->GetValue()->GetAsBoolean(&result);
       DCHECK(success);
     }
   }
   return result;
 }