Create non-blocked fifo

content/shell/android/browsertests_apk/content_browser_tests_android.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.
 
 // This class sets up the environment for running the content browser tests
 // inside an android application.
 
 #include <android/log.h>
 #include <unistd.h>
 
@@ skipping 69 matching lines @@
   // Specify a socket name to not conflict with the default one used
   // in content_shell.
   command_line->AppendSwitchASCII(switches::kRemoteDebuggingSocketName,
                                   "content_browsertests_devtools_remote");
 
   // Create fifo and redirect stdout and stderr to it.
   base::FilePath files_dir(
       base::android::ConvertJavaStringToUTF8(env, jfiles_dir));
   base::FilePath fifo_path(files_dir.Append(base::FilePath("test.fifo")));
   base::android::CreateFIFO(fifo_path, 0666);
-  base::android::RedirectStream(stdout, fifo_path, "w");
+  base::android::RedirectStream(stdout, fifo_path, "w+");
   dup2(STDOUT_FILENO, STDERR_FILENO);
 
   ScopedMainEntryLogger scoped_main_entry_logger;
   main(argc, &argv[0]);
 }
 
 bool RegisterContentBrowserTestsAndroid(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content