Index: base/test/histogram_recorder.h |
diff --git a/base/test/histogram_recorder.h b/base/test/histogram_recorder.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..85139bd8b05f9e45aa6c95f2691b512f7be3e790 |
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+++ b/base/test/histogram_recorder.h |
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+// 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_HISTOGRAM_RECORDER_H_ |
+#define BASE_TEST_HISTOGRAM_RECORDER_H_ |
+ |
+#include <map> |
+ |
+#include "base/memory/scoped_ptr.h" |
+#include "base/metrics/histogram_samples.h" |
+ |
+namespace base { |
+ |
+// This class acts as a differential reader for histogram samples, enabling |
+// tests to check that metrics were sent as they should be. |
+class HistogramRecorder { |
+ public: |
+ HistogramRecorder(); |
+ virtual ~HistogramRecorder(); |
+ |
+ // Returns the histogram data accumulated since this instance was created. |
+ // Returns NULL if no samples are available. |
+ scoped_ptr<HistogramSamples> GetHistogramSamplesSinceCreation( |
+ const std::string& histogram_name); |
+ |
+ private: |
+ // Used to determine the histogram changes made during this instance's |
+ // lifecycle. |
+ std::map<std::string, HistogramSamples*> original_samples_; |
+}; |
+ |
+} // namespace base |
+ |
+#endif // BASE_TEST_HISTOGRAM_RECORDER_H_ |