Extract guts of ChromeStabilityMetricsProvider into helper class

chrome/browser/memory/tab_manager.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 "chrome/browser/memory/tab_manager.h"
 
 #include <algorithm>
 #include <set>
 #include <vector>
 
 #include "ash/multi_profile_uma.h"
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/memory/memory_pressure_monitor.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/process/process.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/memory/oom_memory_details.h"
-#include "chrome/browser/memory/system_memory_stats_recorder.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_iterator.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_iterator.h"
 #include "chrome/browser/ui/tabs/tab_discard_state.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/tabs/tab_utils.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/url_constants.h"
+#include "components/metrics/system_memory_stats_recorder.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/web_contents.h"
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/memory/tab_manager_delegate_chromeos.h"
 #endif
 
 using base::TimeDelta;
 using base::TimeTicks;
@@ skipping 236 matching lines @@
     int interval_ms = static_cast<int>(interval.InMilliseconds());
     // Record time in milliseconds over an interval of approximately 1 day.
     // Start at 100 ms to get extra resolution in the target 750 ms range.
     UMA_HISTOGRAM_CUSTOM_COUNTS("Tabs.Discard.IntervalTime2", interval_ms, 100,
                                 100000 * 1000, 50);
   }
 // TODO(georgesak): Remove this #if when RecordMemoryStats is implemented for
 // all platforms.
 #if defined(OS_WIN) || defined(OS_CHROMEOS)
   // Record system memory usage at the time of the discard.
-  RecordMemoryStats(RECORD_MEMORY_STATS_TAB_DISCARDED);
+  metrics::RecordMemoryStats(metrics::RECORD_MEMORY_STATS_TAB_DISCARDED);
 #endif
   // Set up to record the next interval.
   last_discard_time_ = TimeTicks::Now();
 }
 
 void TabManager::RecordRecentTabDiscard() {
   // If we are shutting down, do not do anything.
   if (g_browser_process->IsShuttingDown())
     return;
 
@@ skipping 166 matching lines @@
   // sudden_termination_allowed false, and that covers too many common pages
   // with ad networks and statistics scripts.  Ideally we would like to check
   // for beforeUnload handlers, which are likely to present a dialog asking
   // if the user wants to discard state.  crbug.com/123049
 
   // Being more recently active is more important.
   return first.last_active > second.last_active;
 }
 
 }  // namespace memory