TabManager: Set OOM scores via a new debugd interface on ChromeOS.

chromeos/dbus/debug_daemon_client.h

Index: chromeos/dbus/debug_daemon_client.h
diff --git a/chromeos/dbus/debug_daemon_client.h b/chromeos/dbus/debug_daemon_client.h
index 20d2ae331443d763b0f8a4f5a0d20c7d64679c3d..af32bdc4ce0617594d7178bdda8a9aef2e42a70e 100644
--- a/chromeos/dbus/debug_daemon_client.h
+++ b/chromeos/dbus/debug_daemon_client.h
@@ -6,8 +6,11 @@
 #define CHROMEOS_DBUS_DEBUG_DAEMON_CLIENT_H_
 
 #include <stdint.h>
+#include <sys/types.h>
 
 #include <map>
+#include <string>
+#include <vector>
 
 #include "base/callback.h"
 #include "base/files/file.h"
@@ -194,6 +197,18 @@ class CHROMEOS_EXPORT DebugDaemonClient
   virtual void WaitForServiceToBeAvailable(
       const WaitForServiceToBeAvailableCallback& callback) = 0;
 
+  // A callback for SetOomScoreAdj().
+  typedef base::Callback<void(bool success, const std::string& output)>
+      SetOomScoreAdjCallback;
+
+  // Set OOM score oom_score_adj for some process.
+  // Note that the corresponding DBus configuration of the debugd method
+  // "SetOomScoreAdj" only permits setting OOM score for processes running by
+  // user chronos or Android apps.
+  virtual void SetOomScoreAdj(
+      const std::map<pid_t, int32_t>& pid_to_oom_score_adj,
+      const SetOomScoreAdjCallback& callback) = 0;
+
   // Factory function, creates a new instance and returns ownership.
   // For normal usage, access the singleton via DBusThreadManager::Get().
   static DebugDaemonClient* Create();