GTTF: Add a flag controlling handling of test stdio by the new launcher.

base/test/launcher/test_launcher.cc

 // Copyright 2013 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.
 
 #include "base/test/launcher/test_launcher.h"
 
 #if defined(OS_POSIX)
 #include <fcntl.h>
 #endif
 
@@ skipping 251 matching lines @@
       LOG(ERROR) << "Failed to save test launcher output summary.";
     }
   }
 
   return run_result_;
 }
 
 void TestLauncher::OnTestFinished(const TestResult& result) {
   ++test_finished_count_;
 
+  bool print_snippet = false;
+  std::string print_test_stdio("auto");
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kTestLauncherPrintTestStdio)) {
+    print_test_stdio = CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+        switches::kTestLauncherPrintTestStdio);
+  }
+  if (print_test_stdio == "auto") {
+    print_snippet = (result.status != TestResult::TEST_SUCCESS);
+  } else if (print_test_stdio == "always") {
+    print_snippet = true;
+  } else if (print_test_stdio == "never") {
+    print_snippet = false;
+  } else {
+    LOG(WARNING) << "Invalid value of " << switches::kTestLauncherPrintTestStdio
+                 << ": " << print_test_stdio;
+  }
+  if (print_snippet) {
+    fprintf(stdout, "%s", result.output_snippet.c_str());
+    fflush(stdout);
+  }
+
   if (result.status == TestResult::TEST_SUCCESS) {
     ++test_success_count_;
   } else {
     tests_to_retry_.insert(result.full_name);
-
-    fprintf(stdout, "%s", result.output_snippet.c_str());
-    fflush(stdout);
   }
 
   results_tracker_.AddTestResult(result);
 
   // TODO(phajdan.jr): Align counter (padding).
   std::string status_line(
       StringPrintf("[%" PRIuS "/%" PRIuS "] %s ",
                    test_finished_count_,
                    test_started_count_,
                    result.full_name.c_str()));
@@ skipping 360 matching lines @@
 
     g_live_process_handles.Get().erase(process_handle);
   }
 
   base::CloseProcessHandle(process_handle);
 
   return exit_code;
 }
 
 }  // namespace base