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

base/test/perf_time_logger.cc

Index: base/test/perf_time_logger.cc
diff --git a/base/test/perf_time_logger.cc b/base/test/perf_time_logger.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c05ba51b7d84d70df2e590e27b7b6fa39d42fb61
--- /dev/null
+++ b/base/test/perf_time_logger.cc
@@ -0,0 +1,27 @@
+// 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/perf_time_logger.h"
+
+#include "base/test/perf_log.h"
+
+namespace base {
+
+PerfTimeLogger::PerfTimeLogger(const char* test_name)
+    : logged_(false), test_name_(test_name) {}
+
+PerfTimeLogger::~PerfTimeLogger() {
+  if (!logged_)
+    Done();
+}
+
+void PerfTimeLogger::Done() {
+  // we use a floating-point millisecond value because it is more
+  // intuitive than microseconds and we want more precision than
+  // integer milliseconds
+  LogPerfResult(test_name_.c_str(), timer_.Elapsed().InMillisecondsF(), "ms");
+  logged_ = true;
+}
+
+}  // namespace base