Show the stack trace for renderer process crashes.

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 e827686abd877ef9d86c3517eaaba667f62192f2..f6dc886c184605915003b664676ac5fec5523f4f 100644
--- a/content/renderer/renderer_main.cc
+++ b/content/renderer/renderer_main.cc
@@ -212,6 +212,12 @@ int RendererMain(const content::MainFunctionParams& parameters) {
       run_loop = platform.EnableSandbox();
     } else {
       LOG(ERROR) << "Running without renderer sandbox";
+#ifndef NDEBUG
+      // For convenience, we print the stack trace for crashes. We can't get
+      // symbols when the sandbox is enabled, so only try when the sandbox is
+      // disabled.
+      base::EnableInProcessStackDumping();
+#endif
     }
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
     RenderProcessImpl render_process;