Revert 157168 - Add guards to metric values; erase bad events/metrics from db

chrome/browser/performance_monitor/metric.cc

 // Copyright (c) 2012 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 "chrome/browser/performance_monitor/metric.h"
 
-#include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
-#include "base/time.h"
-#include "chrome/browser/performance_monitor/constants.h"
 
 namespace performance_monitor {
 
-namespace {
-
-// For certain metrics (for instance, bytes read), it is possible that there is
-// no maximum value which we can safely assume.
-const double kNoMaximum = -1.0;
-
-// These constants are designed to keep metrics reasonable. However, due to the
-// variety of system configurations which can run chrome, these values may not
-// catch *all* erroneous values. For instance, on a one-CPU machine, any CPU
-// usage > 100 is erroneous, but on a 16-CPU machine, it's perfectly normal.
-// These are "best-guesses" in order to weed out obviously-false values. A
-// metric is valid if it is greater than or equal to the minimum and less than
-// the maximum, i.e. if it falls in the range [min, max).
-const double kMinUndefined = 0.0;
-const double kMaxUndefined = 0.0;  // No undefined metric is valid.
-const double kMinCpuUsage = 0.0;
-const double kMaxCpuUsage = 100000.0;  // 100% on a 1000-CPU machine.
-const double kMinPrivateMemoryUsage = 0.0;
-const double kMaxPrivateMemoryUsage = kBytesPerTerabyte;
-const double kMinSharedMemoryUsage = 0.0;
-const double kMaxSharedMemoryUsage = kBytesPerTerabyte;
-const double kMinStartupTime = 0.0;
-const double kMaxStartupTime = base::Time::kMicrosecondsPerMinute * 15.0;
-const double kMinTestStartupTime = 0.0;
-const double kMaxTestStartupTime = base::Time::kMicrosecondsPerMinute * 15.0;
-const double kMinSessionRestoreTime = 0.0;
-const double kMaxSessionRestoreTime = base::Time::kMicrosecondsPerMinute * 15.0;
-const double kMinPageLoadTime = 0.0;
-const double kMaxPageLoadTime = base::Time::kMicrosecondsPerMinute * 15.0;
-const double kMinNetworkBytesRead = 0.0;
-const double kMaxNetworkBytesRead = kNoMaximum;
-
-struct MetricBound {
-  double min;
-  double max;
-};
-
-const MetricBound kMetricBounds[] = {
- { kMinUndefined, kMaxUndefined },
- { kMinCpuUsage, kMaxCpuUsage },
- { kMinPrivateMemoryUsage, kMaxPrivateMemoryUsage },
- { kMinSharedMemoryUsage, kMaxSharedMemoryUsage },
- { kMinStartupTime, kMaxStartupTime },
- { kMinTestStartupTime, kMaxTestStartupTime },
- { kMinSessionRestoreTime, kMaxSessionRestoreTime },
- { kMinPageLoadTime, kMaxPageLoadTime },
- { kMinNetworkBytesRead, kMaxNetworkBytesRead },
-};
-
-COMPILE_ASSERT(ARRAYSIZE_UNSAFE(kMetricBounds) == METRIC_NUMBER_OF_METRICS,
-               metric_bounds_size_doesnt_match_metric_count);
-
-}  // namespace
-
 Metric::Metric() {
   value = 0.0;
 }
 
-Metric::Metric(MetricType metric_type,
-               const base::Time& metric_time,
-               const double metric_value)
-    : type(metric_type), time(metric_time), value(metric_value) {
+Metric::Metric(const base::Time& metric_time, const double metric_value)
+    : time(metric_time), value(metric_value) {
 }
 
-Metric::Metric(MetricType metric_type,
-               const std::string& metric_time,
-               const std::string& metric_value) : type(metric_type) {
+Metric::Metric(const std::string& metric_time,
+               const std::string& metric_value) {
   int64 conversion = 0;
   base::StringToInt64(metric_time, &conversion);
   time = base::Time::FromInternalValue(conversion);
   CHECK(base::StringToDouble(metric_value, &value));
 }
 
 Metric::~Metric() {
 }
 
-bool Metric::IsValid() const {
-  return type < METRIC_NUMBER_OF_METRICS &&
-      (value < kMetricBounds[type].max ||
-          kMetricBounds[type].max == kNoMaximum) &&
-      value >= kMetricBounds[type].min;
-}
-
-std::string Metric::ValueAsString() const {
-  return base::DoubleToString(value);
-}
-
 }  // namespace performance_monitor