Allow setting oom_score_adj for services spawned from init

(cherry picked from commit f7adf8e4739812a2a4f194b17f84f4b9df42d04b)

Bug: 29831602
Change-Id: I4d24264bb6e879935a0b2adbb2e49ddf458980cf
diff --git a/init/service.h b/init/service.h
index fb03a07..4a3412c 100644
--- a/init/service.h
+++ b/init/service.h
@@ -126,6 +126,7 @@
     bool ParseKeycodes(const std::vector<std::string>& args, std::string* err);
     bool ParseOneshot(const std::vector<std::string>& args, std::string* err);
     bool ParseOnrestart(const std::vector<std::string>& args, std::string* err);
+    bool ParseOomScoreAdjust(const std::vector<std::string>& args, std::string* err);
     bool ParseNamespace(const std::vector<std::string>& args, std::string* err);
     bool ParseSeclabel(const std::vector<std::string>& args, std::string* err);
     bool ParseSetenv(const std::vector<std::string>& args, std::string* err);
@@ -165,6 +166,8 @@
     int ioprio_pri_;
     int priority_;
 
+    int oom_score_adjust_;
+
     std::vector<std::string> args_;
 };