Index: media/base/scoped_histogram_timer.h |
diff --git a/media/base/scoped_histogram_timer.h b/media/base/scoped_histogram_timer.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..39daa567a036ce1010347b38744e39719782d37d |
--- /dev/null |
+++ b/media/base/scoped_histogram_timer.h |
@@ -0,0 +1,32 @@ |
+// 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 MEDIA_BASE_SCOPED_HISTOGRAM_TIMER_H_ |
+#define MEDIA_BASE_SCOPED_HISTOGRAM_TIMER_H_ |
+ |
+#include "base/metrics/histogram.h" |
+#include "base/time.h" |
+ |
+// Scoped class which logs its time on this earth as a UMA statistic. Must be |
+// a #define macro since UMA macros prevent variables as names. The nested |
+// macro is necessary to expand __COUNTER__ to an actual value. |
+#define SCOPED_UMA_HISTOGRAM_TIMER(name) \ |
+ SCOPED_UMA_HISTOGRAM_TIMER_EXPANDER(name, __COUNTER__) |
+ |
+#define SCOPED_UMA_HISTOGRAM_TIMER_EXPANDER(name, key) \ |
+ SCOPED_UMA_HISTOGRAM_TIMER_UNIQUE(name, key) |
+ |
+#define SCOPED_UMA_HISTOGRAM_TIMER_UNIQUE(name, key) \ |
+ class ScopedHistogramTimer##key { \ |
+ public: \ |
+ ScopedHistogramTimer##key() : constructed_(base::TimeTicks::Now()) {} \ |
+ ~ScopedHistogramTimer##key() { \ |
+ base::TimeDelta elapsed = base::TimeTicks::Now() - constructed_; \ |
+ UMA_HISTOGRAM_TIMES(name, elapsed); \ |
+ } \ |
+ private: \ |
+ base::TimeTicks constructed_; \ |
+ } scoped_histogram_timer_##key |
+ |
+#endif // MEDIA_BASE_SCOPED_HISTOGRAM_TIMER_H_ |