Allow internal usage of SIGQUIT signal listening.

runtime/bin/process_android.cc

Index: runtime/bin/process_android.cc
diff --git a/runtime/bin/process_android.cc b/runtime/bin/process_android.cc
index 1e7c2ada8f86c4c5e8ff6094585aded6cc8edc9f..c13aa980e39bad0e45cc0f1a54c0d75a98c02a72 100644
--- a/runtime/bin/process_android.cc
+++ b/runtime/bin/process_android.cc
@@ -636,14 +636,15 @@ intptr_t Process::CurrentProcessId() {
 
 static Mutex* signal_mutex = new Mutex();
 static SignalInfo* signal_handlers = NULL;
-static const int kSignalsCount = 6;
+static const int kSignalsCount = 7;
 static const int kSignals[kSignalsCount] = {
   SIGHUP,
   SIGINT,
   SIGTERM,
   SIGUSR1,
   SIGUSR2,
-  SIGWINCH
+  SIGWINCH,
+  SIGQUIT  // Allow VMService to listen on SIGQUIT.
 };