Make --wait-for-debugger work for mandoline launcher process.

mojo/runner/init.cc

Index: mojo/runner/init.cc
diff --git a/mojo/runner/init.cc b/mojo/runner/init.cc
index 0656c6ec90dd182b6ea47ff9daaac88b96c60d9b..4a8d7007ccea33f5b2eba3e665d5bbc3aa4d2467 100644
--- a/mojo/runner/init.cc
+++ b/mojo/runner/init.cc
@@ -4,7 +4,18 @@
 
 #include "mojo/runner/init.h"
 
+#include "base/base_switches.h"
+#include "base/command_line.h"
+#include "base/debug/debugger.h"
 #include "base/logging.h"
+#include "base/stl_util.h"
+#include "base/strings/string_split.h"
+#include "base/strings/utf_string_conversions.h"
+#include "mojo/runner/switches.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#endif
 
 namespace mojo {
 namespace runner {
@@ -20,5 +31,28 @@ void InitializeLogging() {
                        false);  // Tick count
 }
 
+void WaitForDebuggerIfNecessary() {
+  const base::CommandLine* command_line =
+      base::CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kWaitForDebugger)) {
+    std::vector<std::string> apps_to_debug;
+    base::SplitString(
+        command_line->GetSwitchValueASCII(switches::kWaitForDebugger), ',',
+        &apps_to_debug);
+    std::string app = command_line->GetSwitchValueASCII(switches::kApp);
+    if (app.empty())
+      app = "launcher";  // If we're not in a child process look for "launcher".
+    if (apps_to_debug.empty() || ContainsValue(apps_to_debug, app)) {
+#if defined(OS_WIN)
+      base::string16 appw = base::UTF8ToUTF16(app);
+      MessageBox(NULL, appw.c_str(), appw.c_str(), MB_OK | MB_SETFOREGROUND);
+#else
+      LOG(ERROR) << app << " waiting for GDB. pid: " << getpid();
+      base::debug::WaitForDebugger(60, true);
+#endif
+    }
+  }
+}
+
 }  // namespace runner
 }  // namespace mojo