cc: Measure compositor timing with finer granularity

cc/trees/proxy_timing_history.cc

Index: cc/trees/proxy_timing_history.cc
diff --git a/cc/trees/proxy_timing_history.cc b/cc/trees/proxy_timing_history.cc
deleted file mode 100644
index 90abad1632f585c407106d556d52d7c3de5ad2cf..0000000000000000000000000000000000000000
--- a/cc/trees/proxy_timing_history.cc
+++ /dev/null
@@ -1,124 +0,0 @@
-// Copyright 2014 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 "cc/trees/proxy_timing_history.h"
-
-#include "base/metrics/histogram.h"
-
-const size_t kDurationHistorySize = 60;
-const double kCommitAndActivationDurationEstimationPercentile = 50.0;
-const double kDrawDurationEstimationPercentile = 100.0;
-const int kDrawDurationEstimatePaddingInMicroseconds = 0;
-
-namespace cc {
-
-ProxyTimingHistory::ProxyTimingHistory(
-    RenderingStatsInstrumentation* rendering_stats_instrumentation)
-    : draw_duration_history_(kDurationHistorySize),
-      begin_main_frame_to_commit_duration_history_(kDurationHistorySize),
-      commit_to_activate_duration_history_(kDurationHistorySize),
-      rendering_stats_instrumentation_(rendering_stats_instrumentation) {
-}
-
-ProxyTimingHistory::~ProxyTimingHistory() {}
-
-base::TimeDelta ProxyTimingHistory::DrawDurationEstimate() const {
-  base::TimeDelta historical_estimate =
-      draw_duration_history_.Percentile(kDrawDurationEstimationPercentile);
-  base::TimeDelta padding = base::TimeDelta::FromMicroseconds(
-      kDrawDurationEstimatePaddingInMicroseconds);
-  return historical_estimate + padding;
-}
-
-base::TimeDelta ProxyTimingHistory::BeginMainFrameToCommitDurationEstimate()
-    const {
-  return begin_main_frame_to_commit_duration_history_.Percentile(
-      kCommitAndActivationDurationEstimationPercentile);
-}
-
-base::TimeDelta ProxyTimingHistory::CommitToActivateDurationEstimate() const {
-  return commit_to_activate_duration_history_.Percentile(
-      kCommitAndActivationDurationEstimationPercentile);
-}
-
-void ProxyTimingHistory::DidBeginMainFrame() {
-  begin_main_frame_sent_time_ = base::TimeTicks::Now();
-}
-
-void ProxyTimingHistory::DidCommit() {
-  commit_complete_time_ = base::TimeTicks::Now();
-  base::TimeDelta begin_main_frame_to_commit_duration =
-      commit_complete_time_ - begin_main_frame_sent_time_;
-
-  // Before adding the new data point to the timing history, see what we would
-  // have predicted for this frame. This allows us to keep track of the accuracy
-  // of our predictions.
-  rendering_stats_instrumentation_->AddBeginMainFrameToCommitDuration(
-      begin_main_frame_to_commit_duration,
-      BeginMainFrameToCommitDurationEstimate());
-
-  begin_main_frame_to_commit_duration_history_.InsertSample(
-      begin_main_frame_to_commit_duration);
-}
-
-void ProxyTimingHistory::DidActivateSyncTree() {
-  base::TimeDelta commit_to_activate_duration =
-      base::TimeTicks::Now() - commit_complete_time_;
-
-  // Before adding the new data point to the timing history, see what we would
-  // have predicted for this frame. This allows us to keep track of the accuracy
-  // of our predictions.
-  rendering_stats_instrumentation_->AddCommitToActivateDuration(
-      commit_to_activate_duration, CommitToActivateDurationEstimate());
-
-  commit_to_activate_duration_history_.InsertSample(
-      commit_to_activate_duration);
-}
-
-void ProxyTimingHistory::DidStartDrawing() {
-  start_draw_time_ = base::TimeTicks::Now();
-}
-
-void ProxyTimingHistory::DidFinishDrawing() {
-  base::TimeDelta draw_duration = base::TimeTicks::Now() - start_draw_time_;
-
-  // Before adding the new data point to the timing history, see what we would
-  // have predicted for this frame. This allows us to keep track of the accuracy
-  // of our predictions.
-  base::TimeDelta draw_duration_estimate = DrawDurationEstimate();
-  rendering_stats_instrumentation_->AddDrawDuration(draw_duration,
-                                                    draw_duration_estimate);
-
-  AddDrawDurationUMA(draw_duration, draw_duration_estimate);
-
-  draw_duration_history_.InsertSample(draw_duration);
-}
-
-void ProxyTimingHistory::AddDrawDurationUMA(
-    base::TimeDelta draw_duration,
-    base::TimeDelta draw_duration_estimate) {
-  base::TimeDelta draw_duration_overestimate;
-  base::TimeDelta draw_duration_underestimate;
-  if (draw_duration > draw_duration_estimate)
-    draw_duration_underestimate = draw_duration - draw_duration_estimate;
-  else
-    draw_duration_overestimate = draw_duration_estimate - draw_duration;
-  UMA_HISTOGRAM_CUSTOM_TIMES("Renderer.DrawDuration",
-                             draw_duration,
-                             base::TimeDelta::FromMilliseconds(1),
-                             base::TimeDelta::FromMilliseconds(100),
-                             50);
-  UMA_HISTOGRAM_CUSTOM_TIMES("Renderer.DrawDurationUnderestimate",
-                             draw_duration_underestimate,
-                             base::TimeDelta::FromMilliseconds(1),
-                             base::TimeDelta::FromMilliseconds(100),
-                             50);
-  UMA_HISTOGRAM_CUSTOM_TIMES("Renderer.DrawDurationOverestimate",
-                             draw_duration_overestimate,
-                             base::TimeDelta::FromMilliseconds(1),
-                             base::TimeDelta::FromMilliseconds(100),
-                             50);
-}
-
-}  // namespace cc