base: Split logging functions and PerfTimeLogger out of perftimer.h

base/test/perf_time_logger.h

Index: base/test/perf_time_logger.h
diff --git a/base/test/perf_time_logger.h b/base/test/perf_time_logger.h
new file mode 100644
index 0000000000000000000000000000000000000000..f23c5306c1020c02bc4db3c478655c785074e8f6
--- /dev/null
+++ b/base/test/perf_time_logger.h
@@ -0,0 +1,37 @@
+// 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.
+
+#ifndef BASE_TEST_PERF_TIME_LOGGER_H_
+#define BASE_TEST_PERF_TIME_LOGGER_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/test/perftimer.h"
+
+namespace base {
+
+// Automates calling LogPerfResult for the common case where you want
+// to measure the time that something took. Call Done() when the test
+// is complete if you do extra work after the test or there are stack
+// objects with potentially expensive constructors. Otherwise, this
+// class with automatically log on destruction.
+class PerfTimeLogger {
+ public:
+  explicit PerfTimeLogger(const char* test_name);
+  ~PerfTimeLogger();
+
+  void Done();
+
+ private:
+  bool logged_;
+  std::string test_name_;
+  PerfTimer timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(PerfTimeLogger);
+};
+
+}  // namespace base
+
+#endif  // BASE_TEST_PERF_TIME_LOGGER_H_