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

cc/base/histograms.cc

-// 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.
-
-#include "cc/base/histograms.h"
-
-#include <algorithm>
-#include <cmath>
-#include <limits>
-
-#include "base/numerics/safe_conversions.h"
-
-namespace cc {
-
-// Minimum elapsed time of 1us to limit weighting of fast calls.
-static const int64 kMinimumTimeMicroseconds = 1;
-
-ScopedUMAHistogramAreaTimerBase::ScopedUMAHistogramAreaTimerBase() : area_(0) {
-}
-
-ScopedUMAHistogramAreaTimerBase::~ScopedUMAHistogramAreaTimerBase() {
-}
-
-void ScopedUMAHistogramAreaTimerBase::GetHistogramValues(
-    Sample* time_microseconds,
-    Sample* pixels_per_ms) const {
-  GetHistogramValues(timer_.Elapsed(),
-                     area_.ValueOrDefault(std::numeric_limits<int>::max()),
-                     time_microseconds, pixels_per_ms);
-}
-
-// static
-void ScopedUMAHistogramAreaTimerBase::GetHistogramValues(
-    base::TimeDelta elapsed,
-    int area,
-    Sample* time_microseconds,
-    Sample* pixels_per_ms) {
-  elapsed = std::max(
-      elapsed, base::TimeDelta::FromMicroseconds(kMinimumTimeMicroseconds));
-  double area_per_time = area / elapsed.InMillisecondsF();
-  DCHECK(!std::isnan(area_per_time));
-  *time_microseconds = base::saturated_cast<Sample>(elapsed.InMicroseconds());
-  *pixels_per_ms = base::saturated_cast<Sample>(area_per_time);
-}
-
-}  // namespace cc