TabManagerDelegator: Disable kernel lowmemorykiller if memory management is handled by Chrome.

chrome/browser/memory/tab_manager_delegate_chromeos.cc

 // 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.
 
 #include "chrome/browser/memory/tab_manager_delegate_chromeos.h"
 
 #include <algorithm>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 116 matching lines @@
     arc_bridge_service->RemoveObserver(this);
 }
 
 void TabManagerDelegate::OnProcessInstanceReady() {
   auto arc_bridge_service = arc::ArcBridgeService::Get();
   DCHECK(arc_bridge_service);
 
   arc_process_instance_ = arc_bridge_service->process_instance();
   arc_process_instance_version_ = arc_bridge_service->process_version();
 
+  DCHECK(arc_process_instance_);
+
   if (!IsArcMemoryManagementEnabled())
     return;
 
-  DCHECK(arc_process_instance_);
   if (arc_process_instance_version_ < 2) {
     VLOG(1) << "arc::ProcessInstance version < 2 does not "
                "support DisableBuiltinOomAdjustment() yet.";
     return;
   }
   // If --enable-arc-memory-management is on, stop Android system-wide
   // oom_adj adjustment since this class will take over oom_score_adj settings.
   arc_process_instance_->DisableBuiltinOomAdjustment();
+
+  if (arc_process_instance_version_ < 3) {
+    VLOG(1) << "arc::ProcessInstance version < 3 does not "
+               "support DisableLowMemoryKiller() yet.";
+    return;
+  }
+  arc_process_instance_->DisableLowMemoryKiller();
 }
 
 void TabManagerDelegate::OnProcessInstanceClosed() {
   arc_process_instance_ = nullptr;
   arc_process_instance_version_ = 0;
 }
 
 // If able to get the list of ARC procsses, prioritize tabs and apps as a whole.
 // Otherwise try to kill tabs only.
 void TabManagerDelegate::LowMemoryKill(
@@ skipping 317 matching lines @@
       }
     }
     priority += priority_increment;
   }
 
   if (oom_score_for_tabs.size())
     SetOomScoreAdjForTabs(oom_score_for_tabs);
 }
 
 }  // namespace memory