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 277 matching lines @@
 };
 
 // Handles asynchronous fetching of memory details.
 // Will run the provided task after finished.
 class MetricsMemoryDetails : public MemoryDetails {
  public:
   explicit MetricsMemoryDetails(const base::Closure& callback)
       : callback_(callback) {}
 
   virtual void OnDetailsAvailable() {
+    UpdateHistograms();
     MessageLoop::current()->PostTask(FROM_HERE, callback_);
   }
 
  private:
   ~MetricsMemoryDetails() {}
 
   base::Closure callback_;
   DISALLOW_COPY_AND_ASSIGN(MetricsMemoryDetails);
 };
 
@@ skipping 1362 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;
 }