Show all system process in the task_manager.

chrome/browser/task_manager/providers/arc/arc_process_task_provider.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_MANAGER_PROVIDERS_ARC_ARC_PROCESS_TASK_PROVIDER_H_
 #define CHROME_BROWSER_TASK_MANAGER_PROVIDERS_ARC_ARC_PROCESS_TASK_PROVIDER_H_
 
-#include <map>
 #include <memory>
-#include <set>
-#include <string>
+#include <unordered_map>
 #include <vector>
 
+#include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/process/process.h"
 #include "chrome/browser/chromeos/arc/arc_process.h"
 #include "chrome/browser/task_manager/providers/arc/arc_process_task.h"
 #include "chrome/browser/task_manager/providers/task_provider.h"
 
 namespace task_manager {
 
 // This provides the ARC process tasks.
 //
 // Since this provider obtains ARC process information via IPC and procfs,
 // it can never avoid race conditions. For example, in an extreme case such as
 // fork(2) is called millions of times in a second, this provider can return
 // wrong results. However, its chance is very low, and even if we hit the case,
 // the worst outcome is just that an app (non-system) process which
 // the user did not intend to choose is killed. Since apps are designed
 // to be killed at any time, it sounds acceptable.
 class ArcProcessTaskProvider : public TaskProvider {
  public:
   ArcProcessTaskProvider();
   ~ArcProcessTaskProvider() override;
 
   // task_manager::TaskProvider:
   Task* GetTaskOfUrlRequest(int origin_pid,
                             int child_id,
                             int route_id) override;
 
  private:
+  using ArcTaskMap =
+      std::unordered_map<base::ProcessId, std::unique_ptr<ArcProcessTask>>;
+  void ScheduleNextRequest(const base::Closure& task, const int delaySeconds);
+
   // Auto-retry if ARC bridge service is not ready.
-  void RequestProcessList();
+  void RequestAppProcessList();
+  void RequestSystemProcessList();
 
-  void OnUpdateProcessList(const std::vector<arc::ArcProcess>& processes);
+  void UpdateProcessList(ArcTaskMap* pid_to_task,
+                         const std::vector<arc::ArcProcess>& processes);
+  void OnUpdateAppProcessList(const std::vector<arc::ArcProcess>& processes);
+  void OnUpdateSystemProcessList(const std::vector<arc::ArcProcess>& processes);
 
   // task_manager::TaskProvider:
   void StartUpdating() override;
   void StopUpdating() override;
 
-  void ScheduleNextRequest();
+  void ScheduleNextAppRequest();
+  void ScheduleNextSystemRequest();
 
-  std::map<base::ProcessId, std::unique_ptr<ArcProcessTask>> nspid_to_task_;
+  ArcTaskMap nspid_to_task_;
+  ArcTaskMap nspid_to_sys_task_;
 
   // Whether to continue the periodical polling.
   bool is_updating_;
 
   // Always keep this the last member of this class to make sure it's the
   // first thing to be destructed.
   base::WeakPtrFactory<ArcProcessTaskProvider> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcProcessTaskProvider);
 };
 
 }  // namespace task_manager
 
 #endif  // CHROME_BROWSER_TASK_MANAGER_PROVIDERS_ARC_ARC_PROCESS_TASK_PROVIDER_H_