Move perftimer.* into base/test/ directory.

This should address the TODO from tools/gn/secondary/base/BUILD.gn

BUG=None
TEST=test_support_perf
R=brettw@chromium.org
TBR=cpu, dalecurtis, akalin, thestig

Review URL: https://chromiumcodereview.appspot.com/22887041

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@219448 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 85 insertions, 0 deletions

diff --git a/base/test/perftimer.h b/base/test/perftimer.h
new file mode 100644
index 0000000..1a26cf5
--- /dev/null
+++ b/base/test/perftimer.h
@@ -0,0 +1,85 @@
+// 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_PERFTIMER_H_
+#define BASE_TEST_PERFTIMER_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/time/time.h"
+
+namespace base {
+class FilePath;
+}
+
+// ----------------------------------------------------------------------
+// Initializes and finalizes the perf log. These functions should be
+// called at the beginning and end (respectively) of running all the
+// performance tests. The init function returns true on success.
+// ----------------------------------------------------------------------
+bool InitPerfLog(const base::FilePath& log_path);
+void FinalizePerfLog();
+
+// ----------------------------------------------------------------------
+// LogPerfResult
+//   Writes to the perf result log the given 'value' resulting from the
+//   named 'test'. The units are to aid in reading the log by people.
+// ----------------------------------------------------------------------
+void LogPerfResult(const char* test_name, double value, const char* units);
+
+// ----------------------------------------------------------------------
+// PerfTimer
+//   A simple wrapper around Now()
+// ----------------------------------------------------------------------
+class PerfTimer {
+ public:
+  PerfTimer() {
+    begin_ = base::TimeTicks::Now();
+  }
+
+  // Returns the time elapsed since object construction
+  base::TimeDelta Elapsed() const {
+    return base::TimeTicks::Now() - begin_;
+  }
+
+ private:
+  base::TimeTicks begin_;
+};
+
+// ----------------------------------------------------------------------
+// PerfTimeLogger
+//   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)
+      : logged_(false),
+        test_name_(test_name) {
+  }
+
+  ~PerfTimeLogger() {
+    if (!logged_)
+      Done();
+  }
+
+  void 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;
+  }
+
+ private:
+  bool logged_;
+  std::string test_name_;
+  PerfTimer timer_;
+};
+
+#endif  // BASE_TEST_PERFTIMER_H_