Index: ui/events/fraction_of_time_without_user_input_recorder.cc |
diff --git a/ui/events/fraction_of_time_without_user_input_recorder.cc b/ui/events/fraction_of_time_without_user_input_recorder.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..de07a510d57a8f5340a229800adfa079aadb8e6c |
--- /dev/null |
+++ b/ui/events/fraction_of_time_without_user_input_recorder.cc |
@@ -0,0 +1,79 @@ |
+// Copyright 2017 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 "ui/events/fraction_of_time_without_user_input_recorder.h" |
+ |
+#include <algorithm> |
+ |
+#include "base/metrics/histogram_macros.h" |
+ |
+namespace { |
+ |
+const base::TimeDelta DEFAULT_WINDOW_SIZE = base::TimeDelta::FromSecondsD(10); |
+const base::TimeDelta DEFAULT_IDLE_TIMEOUT = |
+ base::TimeDelta::FromSecondsD(0.05); |
+ |
+} // namespace |
+ |
+namespace ui { |
+ |
+FractionOfTimeWithoutUserInputRecorder::FractionOfTimeWithoutUserInputRecorder() |
+ : window_size_(DEFAULT_WINDOW_SIZE), idle_timeout_(DEFAULT_IDLE_TIMEOUT) {} |
+ |
+void FractionOfTimeWithoutUserInputRecorder::RecordEventAtTime( |
+ base::TimeTicks start_time) { |
+ base::TimeTicks event_end_time = start_time + idle_timeout_; |
+ |
+ if (active_duration_start_time_.is_null()) |
+ active_duration_start_time_ = start_time; |
+ if (previous_event_end_time_.is_null()) |
+ previous_event_end_time_ = start_time; |
+ |
+ // The user is no longer interacting with the browser. Report the previous |
+ // active duration. |
+ if (previous_event_end_time_ < start_time) { |
+ RecordActiveInterval(active_duration_start_time_, previous_event_end_time_); |
+ active_duration_start_time_ = start_time; |
+ } |
+ |
+ previous_event_end_time_ = event_end_time; |
+} |
+ |
+void FractionOfTimeWithoutUserInputRecorder::RecordActiveInterval( |
+ base::TimeTicks start_time, |
+ base::TimeTicks end_time) { |
+ if (window_start_time_.is_null()) |
+ window_start_time_ = start_time; |
+ |
+ base::TimeTicks window_end_time; |
+ |
+ while (true) { |
+ window_end_time = window_start_time_ + window_size_; |
+ base::TimeDelta interval_in_window_duration = |
+ std::min(end_time, window_end_time) - |
+ std::max(start_time, window_start_time_); |
+ interval_in_window_duration = |
+ std::max(interval_in_window_duration, base::TimeDelta()); |
+ |
+ current_window_active_time_ += interval_in_window_duration; |
+ |
+ // If we haven't exceeded the window bounds, we're done. |
+ if (end_time < window_end_time) |
+ break; |
+ |
+ RecordToUma(current_window_active_time_.InMillisecondsF() / |
+ window_size_.InMillisecondsF()); |
+ |
+ current_window_active_time_ = base::TimeDelta(); |
+ window_start_time_ = window_end_time; |
+ } |
+} |
+ |
+void FractionOfTimeWithoutUserInputRecorder::RecordToUma( |
+ float fraction_active) const { |
+ UMA_HISTOGRAM_PERCENTAGE("Event.FractionOfTimeWithoutUserInput", |
+ std::round((1 - fraction_active) * 100)); |
+} |
+ |
+} // namespace ui |