Reland: Take 2: Force python test server output to be unbuffered, so it doesn't mix with gtest outpu

net/tools/testserver/run_testserver.cc

Index: net/tools/testserver/run_testserver.cc
diff --git a/net/tools/testserver/run_testserver.cc b/net/tools/testserver/run_testserver.cc
index c02d4d6e18290ee6ea016f4e8998fba16db6215e..fd874423d69ad7f57116ed8e0629ad664a1c13f9 100644
--- a/net/tools/testserver/run_testserver.cc
+++ b/net/tools/testserver/run_testserver.cc
@@ -47,6 +47,11 @@ static bool RunSyncTest() {
   }
 
   CommandLine python_command(python_runtime);
+
+  // Use unbuffered output, so that testserver output doesn't mix with gtest
+  // output in test log files. See http://crbug.com/147368.
+  python_command.AppendArg("-u");
+
   python_command.AppendArgPath(sync_test_path);
   if (!base::LaunchProcess(python_command, base::LaunchOptions(), NULL)) {
     LOG(ERROR) << "Failed to launch test script.";