Don't kill a process if it has IMPORTANT_FOREGROUND or higher priority

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 <stdint.h>
 
 #include <algorithm>
 #include <map>
@@ skipping 134 matching lines @@
   // Impossible case. If app and tab are mixed in one process type, favor
   // apps.
   NOTREACHED() << "Undefined comparison between apps and tabs";
   return app();
 }
 
 ProcessType TabManagerDelegate::Candidate::GetProcessTypeInternal() const {
   if (app()) {
     if (app()->is_focused())
       return ProcessType::FOCUSED_APP;
-    if (app()->process_state() == arc::mojom::ProcessState::TOP)
+    if (app()->process_state() <=
+        arc::mojom::ProcessState::IMPORTANT_FOREGROUND) {
       return ProcessType::VISIBLE_APP;
+    }
     return ProcessType::BACKGROUND_APP;
   }
   if (tab()) {
     if (tab()->is_selected)
       return ProcessType::FOCUSED_TAB;
     return ProcessType::BACKGROUND_TAB;
   }
   NOTREACHED() << "Unexpected process type";
   return ProcessType::UNKNOWN_TYPE;
 }
@@ skipping 568 matching lines @@
     }
     priority += priority_increment;
   }
 
   if (oom_scores_to_change.size())
     GetDebugDaemonClient()->SetOomScoreAdj(
         oom_scores_to_change, base::Bind(&OnSetOomScoreAdj));
 }
 
 }  // namespace memory