New test infrastructure for producing verbose logs in failing tests.

chrome/test/logging/win/log_file_printer.h

Index: chrome/test/logging/win/log_file_printer.h
diff --git a/chrome/test/logging/win/log_file_printer.h b/chrome/test/logging/win/log_file_printer.h
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+++ b/chrome/test/logging/win/log_file_printer.h
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+// 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.
+
+// Prints log files produced by Event Tracing for Windows (by way of the
+// FileLogger class) that contain events generated from a select few supported
+// providers; see file_logger_win.h for the list.
+
+#ifndef CHROME_TEST_LOGGING_WIN_LOG_FILE_PRINTER_H_
+#define CHROME_TEST_LOGGING_WIN_LOG_FILE_PRINTER_H_
+#pragma once
+
+#include <iosfwd>
+
+class FilePath;
+
+namespace logging_win {
+
+// Reads |log_file|, emitting messages to |out|.  Although it is safe to call
+// this from multiple threads, only one file may be read at a time; other
+// threads trying to read other log files will be blocked waiting.
+void PrintLogFile(const FilePath& log_file, std::ostream* out);
+
+}  // namespace logging_win
+
+#endif  // CHROME_TEST_LOGGING_WIN_LOG_FILE_PRINTER_H_