Show the stack trace for renderer process crashes.

content/renderer/renderer_main.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/debug/debugger.h"
 #include "base/debug/trace_event.h"
 #include "base/hi_res_timer_manager.h"
 #include "base/i18n/rtl.h"
@@ skipping 194 matching lines @@
     // TODO(markus): Check if it is OK to unconditionally move this
     // instruction down.
     RenderProcessImpl render_process;
     new RenderThreadImpl();
 #endif
     bool run_loop = true;
     if (!no_sandbox) {
       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;
     new RenderThreadImpl();
 #endif
 
     platform.RunSandboxTests();
 
     startup_timer.Stop();  // End of Startup Time Measurement.
 
     if (run_loop) {
 #if defined(OS_MACOSX)
       if (pool)
         pool->Recycle();
 #endif
       TRACE_EVENT_BEGIN_ETW("RendererMain.START_MSG_LOOP", 0, 0);
       MessageLoop::current()->Run();
       TRACE_EVENT_END_ETW("RendererMain.START_MSG_LOOP", 0, 0);
     }
   }
   platform.PlatformUninitialize();
   TRACE_EVENT_END_ETW("RendererMain", 0, "");
   return 0;
 }