Revert "cc: Add UMA stats for record and raster time."

cc/base/histograms.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_BASE_HISTOGRAMS_H_
-#define CC_BASE_HISTOGRAMS_H_
-
-#include "base/compiler_specific.h"
-#include "base/metrics/histogram_base.h"
-#include "base/metrics/histogram_macros.h"
-#include "base/numerics/safe_math.h"
-#include "base/time/time.h"
-#include "base/timer/elapsed_timer.h"
-#include "cc/base/cc_export.h"
-
-namespace cc {
-
-// Emits UMA histogram trackers for time spent as well as area (in pixels)
-// processed per unit time. Time is measured in microseconds, and work in
-// pixels per millisecond.
-//
-// Usage:
-//   // Outside of a method, perhaps in a namespace.
-//   DEFINE_SCOPED_UMA_HISTOGRAM_AREA_TIMER(ScopedReticulateSplinesTimer,
-//                                          "ReticulateSplinesUs",
-//                                          "ReticulateSplinesPixelsPerMs");
-//
-//   // Inside a method.
-//   ScopedReticulateSplinesTimer timer;
-//   timer.AddArea(some_rect.size().GetArea());
-#define DEFINE_SCOPED_UMA_HISTOGRAM_AREA_TIMER(class_name, time_histogram, \
-                                               area_histogram)             \
-  class class_name : public ::cc::ScopedUMAHistogramAreaTimerBase {        \
-   public:                                                                 \
-    ~class_name();                                                         \
-  };                                                                       \
-  class_name::~class_name() {                                              \
-    Sample time_sample;                                                    \
-    Sample area_sample;                                                    \
-    GetHistogramValues(&time_sample, &area_sample);                        \
-    UMA_HISTOGRAM_COUNTS(time_histogram, time_sample);                     \
-    UMA_HISTOGRAM_COUNTS(area_histogram, area_sample);                     \
-  }
-
-class CC_EXPORT ScopedUMAHistogramAreaTimerBase {
- public:
-  void AddArea(int area) { area_ += area; }
-  void SetArea(int area) { area_ = area; }
-
- protected:
-  using Sample = base::HistogramBase::Sample;
-
-  ScopedUMAHistogramAreaTimerBase();
-  ~ScopedUMAHistogramAreaTimerBase();
-
-  // Returns true if histograms should be recorded (i.e. values are valid).
-  void GetHistogramValues(Sample* time_microseconds,
-                          Sample* pixels_per_ms) const;
-
- private:
-  static void GetHistogramValues(base::TimeDelta elapsed,
-                                 int area,
-                                 Sample* time_microseconds,
-                                 Sample* pixels_per_ms);
-
-  base::ElapsedTimer timer_;
-  base::CheckedNumeric<int> area_;
-
-  friend class ScopedUMAHistogramAreaTimerBaseTest;
-  DISALLOW_COPY_AND_ASSIGN(ScopedUMAHistogramAreaTimerBase);
-};
-
-}  // namespace cc
-
-#endif  // CC_BASE_HISTOGRAMS_H_