Add an 'Idle Wake Ups' metric to the Linux task manager, implement backend.

chrome/browser/task_manager/task_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/task_manager/task_manager.h"
 
 #include "base/bind.h"
 #include "base/i18n/number_formatting.h"
 #include "base/i18n/rtl.h"
 #include "base/prefs/pref_registry_simple.h"
@@ skipping 1154 matching lines @@
     }
 #endif  // !defined(DISABLE_NACL)
     if (values.is_cpu_usage_valid && values.is_idle_wakeups_valid)
       continue;
     MetricsMap::iterator metrics_iter = metrics_map_.find(process);
     DCHECK(metrics_iter != metrics_map_.end());
     if (!values.is_cpu_usage_valid) {
       values.is_cpu_usage_valid = true;
       values.cpu_usage = metrics_iter->second->GetCPUUsage();
     }
-#if defined(OS_MACOSX)
-    // TODO: Implement GetIdleWakeupsPerSecond() on other platforms,
+#if defined(OS_MACOSX) || defined(OS_LINUX)
+    // TODO(port): Implement GetIdleWakeupsPerSecond() on other platforms,
     // crbug.com/120488
     if (!values.is_idle_wakeups_valid) {
       values.is_idle_wakeups_valid = true;
       values.idle_wakeups = metrics_iter->second->GetIdleWakeupsPerSecond();
     }
-#endif  // defined(OS_MACOSX)
+#endif  // defined(OS_MACOSX) || defined(OS_LINUX)
   }
 
   // Send a request to refresh GPU memory consumption values
   RefreshVideoMemoryUsageStats();
 
   // Compute the new network usage values.
   base::TimeDelta update_time =
       base::TimeDelta::FromMilliseconds(kUpdateTimeMs);
   for (ResourceValueMap::iterator iter = current_byte_count_map_.begin();
        iter != current_byte_count_map_.end(); ++iter) {
@@ skipping 351 matching lines @@
   params.host_desktop_type = desktop_type;
   chrome::Navigate(&params);
 }
 
 TaskManager::TaskManager()
     : model_(new TaskManagerModel(this)) {
 }
 
 TaskManager::~TaskManager() {
 }