[ChromeOS] Add Swapped Memory to TaskManager

chrome/browser/task_management/sampling/task_group_sampler.h

 // Copyright 2015 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.
 
 #ifndef CHROME_BROWSER_TASK_MANAGEMENT_SAMPLING_TASK_GROUP_SAMPLER_H_
 #define CHROME_BROWSER_TASK_MANAGEMENT_SAMPLING_TASK_GROUP_SAMPLER_H_
 
 #include <stdint.h>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/process/process.h"
 #include "base/process/process_handle.h"
 #include "base/process/process_metrics.h"
 #include "base/sequence_checker.h"
 #include "base/sequenced_task_runner.h"
 #include "build/build_config.h"
 
 namespace task_management {
 
 // Wraps the memory usage stats values together so that it can be sent between
 // the UI and the worker threads.
 struct MemoryUsageStats {
-  int64_t private_bytes;
-  int64_t shared_bytes;
-  int64_t physical_bytes;
+  int64_t private_bytes = -1;
+  int64_t shared_bytes = -1;
+  int64_t physical_bytes = -1;
+#if defined(OS_CHROMEOS)
+  int64_t swapped_bytes = -1;
+#endif
 
-  MemoryUsageStats()
-      : private_bytes(-1),
-        shared_bytes(-1),
-        physical_bytes(-1) {
-  }
+  MemoryUsageStats() {}
 };
 
 // Defines the expensive process' stats sampler that will calculate these
 // resources on the worker thread. Objects of this class are created by the
 // TaskGroups on the UI thread, however it will be used mainly on a blocking
 // pool thread.
 class TaskGroupSampler : public base::RefCountedThreadSafe<TaskGroupSampler> {
  public:
   // The below are the types of the callbacks to the UI thread upon their
   // corresponding refresh are done on the worker thread.
@@ skipping 56 matching lines @@
   // To assert we're running on the correct thread.
   base::SequenceChecker worker_pool_sequenced_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskGroupSampler);
 };
 
 }  // namespace task_management
 
 
 #endif  // CHROME_BROWSER_TASK_MANAGEMENT_SAMPLING_TASK_GROUP_SAMPLER_H_