stanisc@chromium.org

The time from v-sync to when the main side actually starts the BeginImplFrame. Warning: This metric may include reports from clients with low-resolution clocks (i.e. on Windows, ref. |TimeTicks::IsHighResolution()|). Such reports will cause this metric to have an abnormal distribution. When considering revising this histogram, see UMA_HISTOGRAM_CUSTOM_MICROSECONDS_TIMES for the solution.

gab@chromium.org fdoray@chromium.org spvw@chromium.org

Records the number of milliseconds spent in each phase of pumping tasks on {NamedThread}. Each enum value can be analyzed for its total time or as a percentage relative to other phases.

weiliangc@chromium.org chrome-gpu-metrics@chromium.org

The type of deadline mode the Renderer's cc::Scheduler is in when the scheduler enters the BeginImplFrame deadline. This emits immediately as the scheduler enters the deadline.

vmiura@chromium.org speed-metrics-dev@chromium.org chrome-analysis-team@google.com

The time delta between the draw times of back-to-back BeginImplFrames, regardless of whether or not they result in a swap. The interval is only recorded when every BeginImplFrame wants to draw. Do not modify this metric in any way without contacting speed-metrics-dev@chromium.org AND chrome-analysis-team@google.com. Warning: This metric may include reports from clients with low-resolution clocks (i.e. on Windows, ref. |TimeTicks::IsHighResolution()|). Such reports will cause this metric to have an abnormal distribution. When considering revising this histogram, see UMA_HISTOGRAM_CUSTOM_HIGH_RESOLUTION_TIMES for the solution.

fdoray@chromium.org gab@chromium.org robliao@chromium.org

Number of tasks executed by a SchedulerWorker before it detached. Recorded when a SchedulerWorker detaches.

spvw@chromium.org gab@chromium.org

Records a hit when a thread pool worker thread woke up unnecessarily (when the first GetWork called by a WorkerThread post-wakeup doesn't return a task). This count can be compared between experiments aiming to reduce wakeups. Or, it could be used to derive wakeups/{foo} by using UMA formulas against other time-or-event-based metrics.