Update from https://crrev.com/333737

base/process/kill_posix.cc

Index: base/process/kill_posix.cc
diff --git a/base/process/kill_posix.cc b/base/process/kill_posix.cc
index 0e303c67d3cffb431bee2899c88ebbbdea9328e5..f0d2d442274cf170085555c407e80caad6b3968a 100644
--- a/base/process/kill_posix.cc
+++ b/base/process/kill_posix.cc
@@ -50,8 +50,13 @@ TerminationStatus GetTerminationStatusImpl(ProcessHandle handle,
       case SIGILL:
       case SIGSEGV:
         return TERMINATION_STATUS_PROCESS_CRASHED;
-      case SIGINT:
       case SIGKILL:
+#if defined(OS_CHROMEOS)
+        // On ChromeOS, only way a process gets kill by SIGKILL
+        // is by oom-killer.
+        return TERMINATION_STATUS_PROCESS_WAS_KILLED_BY_OOM;
+#endif
+      case SIGINT:
       case SIGTERM:
         return TERMINATION_STATUS_PROCESS_WAS_KILLED;
       default: