Added code for renderer to cleanly exit.

content/renderer/renderer_main.cc

Index: content/renderer/renderer_main.cc
diff --git a/content/renderer/renderer_main.cc b/content/renderer/renderer_main.cc
index 306dee9aaf0ea6a511c53ae66884e431dc7abb29..99f2c06effe44ea6ce54c6df2514e7215f1de30c 100644
--- a/content/renderer/renderer_main.cc
+++ b/content/renderer/renderer_main.cc
@@ -126,6 +126,24 @@ class RendererMessageLoopObserver : public MessageLoop::TaskObserver {
   DISALLOW_COPY_AND_ASSIGN(RendererMessageLoopObserver);
 };
 
+#if defined(RENDERER_CLEAN_EXIT)
+static void SigtermHandler(int signal_number)
+{
+  base::clean_exit(signal_number);
+}
+
+static void AddSigtermHandler()
+{
+  struct sigaction term_action;
+  int return_value;
+  memset(&term_action, 0, sizeof(term_action));
+  term_action.sa_handler = SigtermHandler;
+  sigfillset(&term_action.sa_mask);
+  return_value = sigaction(SIGTERM, &term_action, NULL);
+  CHECK(return_value==0) << "Unable to install SIGTERM handler\n";
+}
+#endif // defined(RENDERER_CLEAN_EXIT)
+
 // mainline routine for running as the Renderer process
 int RendererMain(const content::MainFunctionParams& parameters) {
   TRACE_EVENT_BEGIN_ETW("RendererMain", 0, "");
@@ -232,6 +250,10 @@ int RendererMain(const content::MainFunctionParams& parameters) {
 
     startup_timer.Stop();  // End of Startup Time Measurement.
 
+#if defined(RENDERER_CLEAN_EXIT)
+    AddSigtermHandler();
+#endif
+
     if (run_loop) {
 #if defined(OS_MACOSX)
       if (pool)