Show all system process in the task_manager.

chrome/browser/chromeos/arc/arc_process_service.h

Index: chrome/browser/chromeos/arc/arc_process_service.h
diff --git a/chrome/browser/chromeos/arc/arc_process_service.h b/chrome/browser/chromeos/arc/arc_process_service.h
index 231c58dd7389aca66b9f7f826c2bb68b58ad46e0..ec2c5e7df7001c82a8f4dfef0dabe0464c9f3aa4 100644
--- a/chrome/browser/chromeos/arc/arc_process_service.h
+++ b/chrome/browser/chromeos/arc/arc_process_service.h
@@ -9,8 +9,10 @@
 #include <vector>
 
 #include "base/callback.h"
+#include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "base/process/process_iterator.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/thread_checker.h"
 #include "chrome/browser/chromeos/arc/arc_process.h"
@@ -21,19 +23,26 @@ namespace arc {
 
 // A single global entry to get a list of ARC processes.
 //
-// Call RequestProcessList() on the main UI thread to get a list of all ARC
-// processes. It returns vector<arc::ArcProcess>, which includes pid <-> nspid
-// mapping.
+// Call RequestAppProcessList() / RequestSystemProcessList() on the main UI
+// thread to get a list of all ARC app / system processes. It returns
+// vector<arc::ArcProcess>, which includes pid <-> nspid mapping.
 // Example:
 //   void OnUpdateProcessList(const vector<arc::ArcProcess>&) {...}
 //
 //   arc::ArcProcessService* arc_process_service =
 //       arc::ArcProcessService::Get();
 //   if (!arc_process_service ||
-//       !arc_process_service->RequestProcessList(
+//       !arc_process_service->RequestAppProcessList(
 //           base::Bind(&OnUpdateProcessList)) {
 //     LOG(ERROR) << "ARC process instance not ready.";
 //   }
+//
+// [System Process]
+// The system process here is defined by the scope. If the process is produced
+// under system_server in Android, we regard it as one of Android app process.
+// Otherwise, the processes that are introduced by init would then be regarded
+// as System Process. RequestAppProcessList() is responsible for app processes
+// while RequestSystemProcessList() is responsible for System Processes.
 class ArcProcessService : public ArcService,
                           public ArcBridgeService::Observer {
  public:
@@ -51,11 +60,17 @@ class ArcProcessService : public ArcService,
 
   // Returns true if ARC IPC is ready for process list request,
   // otherwise false.
-  bool RequestProcessList(RequestProcessListCallback callback);
+  bool RequestAppProcessList(RequestProcessListCallback callback);
+  void RequestSystemProcessList(RequestProcessListCallback callback);
 
  private:
   void Reset();
 
+  void GetArcSystemProcessList(std::vector<ArcProcess>* ret_processes);
+
+  static base::ProcessId GetArcInitProcessId(
+      const base::ProcessIterator::ProcessEntries& entry_list);
+
   void OnReceiveProcessList(
       const RequestProcessListCallback& callback,
       mojo::Array<arc::mojom::RunningAppProcessInfoPtr> mojo_processes);
@@ -74,6 +89,9 @@ class ArcProcessService : public ArcService,
 
   void UpdateNspidToPidMap();
 
+  void PostTaskToOwnThreadAndReply(const base::Closure& task,
+                                   const base::Closure& reply);
+
   // Keep a cache pid mapping of all arc processes so to minimize the number of
   // nspid lookup from /proc/<PID>/status.
   // To play safe, always modify |nspid_to_pid_| on the worker thread.