Remove current implementation of frame timing events.

cc/debug/frame_timing_tracker.h

-// Copyright 2015 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 CC_DEBUG_FRAME_TIMING_TRACKER_H_
-#define CC_DEBUG_FRAME_TIMING_TRACKER_H_
-
-#include <stdint.h>
-
-#include <memory>
-#include <unordered_map>
-#include <utility>
-#include <vector>
-
-#include "base/macros.h"
-#include "base/time/time.h"
-#include "cc/base/cc_export.h"
-#include "cc/base/delayed_unique_notifier.h"
-
-namespace cc {
-
-class LayerTreeHostImpl;
-
-// This class maintains a history of timestamps and rect IDs to communicate
-// frame events back to Blink
-// TODO(mpb): Start using this. crbug.com/442554
-class CC_EXPORT FrameTimingTracker {
- public:
-  struct CC_EXPORT CompositeTimingEvent {
-    CompositeTimingEvent(int, base::TimeTicks);
-    ~CompositeTimingEvent();
-
-    int frame_id;
-    base::TimeTicks timestamp;
-  };
-
-  using CompositeTimingSet =
-      std::unordered_map<int64_t, std::vector<CompositeTimingEvent>>;
-
-  struct CC_EXPORT MainFrameTimingEvent {
-    MainFrameTimingEvent(int frame_id,
-                         base::TimeTicks timestamp,
-                         base::TimeTicks end_time);
-    ~MainFrameTimingEvent();
-
-    int frame_id;
-    base::TimeTicks timestamp;
-    base::TimeTicks end_time;
-  };
-
-  using MainFrameTimingSet =
-      std::unordered_map<int64_t, std::vector<MainFrameTimingEvent>>;
-
-  static std::unique_ptr<FrameTimingTracker> Create(
-      LayerTreeHostImpl* layer_tree_host_impl);
-
-  ~FrameTimingTracker();
-
-  // This routine takes all of the individual CompositeEvents stored in the
-  // tracker and collects them by "rect_id", as in the example below.
-  // [ {f_id1,r_id1,t1}, {f_id2,r_id1,t2}, {f_id3,r_id2,t3} ]
-  // ====>
-  // [ {r_id1,<{f_id1,t1},{f_id2,t2}>}, {r_id2,<{f_id3,t3}>} ]
-  std::unique_ptr<CompositeTimingSet> GroupCompositeCountsByRectId();
-
-  // This routine takes all of the individual MainFrameEvents stored in the
-  // tracker and collects them by "rect_id", as in the example below.
-  std::unique_ptr<MainFrameTimingSet> GroupMainFrameCountsByRectId();
-
-  // This routine takes a timestamp and an array of frame_id,rect_id pairs
-  // and generates CompositeTimingEvents (frame_id, timestamp) and adds them to
-  // internal hash_map keyed on rect_id
-  using FrameAndRectIds = std::pair<int, int64_t>;
-  void SaveTimeStamps(base::TimeTicks timestamp,
-                      const std::vector<FrameAndRectIds>& frame_ids);
-
-  void SaveMainFrameTimeStamps(const std::vector<int64_t>& request_ids,
-                               base::TimeTicks main_frame_time,
-                               base::TimeTicks end_time,
-                               int source_frame_number);
-
- private:
-  explicit FrameTimingTracker(LayerTreeHostImpl* layer_tree_host_impl);
-
-  void PostEvents();
-
-  std::unique_ptr<CompositeTimingSet> composite_events_;
-  std::unique_ptr<MainFrameTimingSet> main_frame_events_;
-
-  LayerTreeHostImpl* layer_tree_host_impl_;
-  DelayedUniqueNotifier post_events_notifier_;
-
-  DISALLOW_COPY_AND_ASSIGN(FrameTimingTracker);
-};
-
-}  // namespace cc
-
-#endif  // CC_DEBUG_FRAME_TIMING_TRACKER_H_