Add "run_testserver --sync-test" for easy chromiumsync_test.py launching.

net/test/test_server_win.cc

Index: net/test/test_server_win.cc
diff --git a/net/test/test_server_win.cc b/net/test/test_server_win.cc
index 07bcee5cb60c31cb846267f1f407ab3e8f865717..dc3dc5380d88056f30f8a46febdd655c6a6caded 100644
--- a/net/test/test_server_win.cc
+++ b/net/test/test_server_win.cc
@@ -84,16 +84,20 @@ bool ReadData(HANDLE read_fd, HANDLE write_fd,
 
 namespace net {
 
-bool TestServer::LaunchPython(const FilePath& testserver_path) {
+// static
+FilePath TestServer::GetAbsolutePythonCommandPath() {
   FilePath python_exe;
   if (!PathService::Get(base::DIR_SOURCE_ROOT, &python_exe))
-    return false;
+    return FilePath();
   python_exe = python_exe
       .Append(FILE_PATH_LITERAL("third_party"))
       .Append(FILE_PATH_LITERAL("python_26"))
       .Append(FILE_PATH_LITERAL("python.exe"));
+  return python_exe;
+}
 
-  CommandLine python_command(python_exe);
+bool TestServer::LaunchPython(const FilePath& testserver_path) {
+  CommandLine python_command(GetAbsolutePythonCommandPath());
   python_command.AppendArgPath(testserver_path);
   if (!AddCommandLineArguments(&python_command))
     return false;