POSIX: add command line option to launch renderers in a wrapper

base/command_line.cc

Index: base/command_line.cc
diff --git a/base/command_line.cc b/base/command_line.cc
index cf3e36f444691068824108633290a7c9583109b4..d9a2052794198ee7c40f8faddabd07e5676d7b32 100644
--- a/base/command_line.cc
+++ b/base/command_line.cc
@@ -334,5 +334,15 @@ void CommandLine::AppendArguments(const CommandLine& other,
   for (i = other.switches_.begin(); i != other.switches_.end(); ++i)
     switches_[i->first] = i->second;
 }
+
+void CommandLine::PrependWrapper(const std::wstring& wrapper_wide) {
+  // The wrapper may have embedded arguments (like "gdb --args"). In this case,
+  // we don't pretend to do anything fancy, we just split on spaces.
+  const std::string wrapper = WideToASCII(wrapper_wide);
+  std::vector<std::string> wrapper_and_args;
+  SplitString(wrapper, ' ', &wrapper_and_args);
+  argv_.insert(argv_.begin(), wrapper_and_args.begin(), wrapper_and_args.end());
+}
+
 #endif