Stack sampling profiler: move configuration to chrome/common

chrome/browser/stack_sampling_configuration.cc

Index: chrome/browser/stack_sampling_configuration.cc
diff --git a/chrome/browser/stack_sampling_configuration.cc b/chrome/browser/stack_sampling_configuration.cc
deleted file mode 100644
index 925b9596c37f01f1087e1894b987c03f7e44e709..0000000000000000000000000000000000000000
--- a/chrome/browser/stack_sampling_configuration.cc
+++ /dev/null
@@ -1,159 +0,0 @@
-// 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 "chrome/browser/stack_sampling_configuration.h"
-
-#include "base/rand_util.h"
-#include "chrome/browser/metrics/chrome_metrics_service_accessor.h"
-#include "chrome/common/channel_info.h"
-#include "components/version_info/version_info.h"
-
-namespace {
-
-// The profiler is currently only implemented for Windows x64, and only runs on
-// trunk, canary, and dev.
-bool IsProfilerSupported() {
-#if !defined(_WIN64)
-  return false;
-#else
-  const version_info::Channel channel = chrome::GetChannel();
-  return (channel == version_info::Channel::UNKNOWN ||
-          channel == version_info::Channel::CANARY ||
-          channel == version_info::Channel::DEV);
-#endif
-}
-
-}  // namespace
-
-StackSamplingConfiguration::StackSamplingConfiguration()
-    : configuration_(GenerateConfiguration()) {
-}
-
-base::StackSamplingProfiler::SamplingParams
-StackSamplingConfiguration::GetSamplingParams() const {
-  base::StackSamplingProfiler::SamplingParams params;
-  params.bursts = 1;
-  const base::TimeDelta duration = base::TimeDelta::FromSeconds(30);
-
-  switch (configuration_) {
-    case PROFILE_DISABLED:
-    case PROFILE_CONTROL:
-      params.initial_delay = base::TimeDelta::FromMilliseconds(0);
-      params.sampling_interval = base::TimeDelta::FromMilliseconds(0);
-      params.samples_per_burst = 0;
-      break;
-
-    case PROFILE_NO_SAMPLES:
-      params.initial_delay = duration;
-      params.sampling_interval = base::TimeDelta::FromMilliseconds(0);
-      params.samples_per_burst = 0;
-      break;
-
-    case PROFILE_5HZ:
-      params.initial_delay = base::TimeDelta::FromMilliseconds(0);
-      params.sampling_interval = base::TimeDelta::FromMilliseconds(200);
-      params.samples_per_burst = duration / params.sampling_interval;
-      break;
-
-    case PROFILE_10HZ:
-      params.initial_delay = base::TimeDelta::FromMilliseconds(0);
-      params.sampling_interval = base::TimeDelta::FromMilliseconds(100);
-      params.samples_per_burst = duration / params.sampling_interval;
-      break;
-
-    case PROFILE_100HZ:
-      params.initial_delay = base::TimeDelta::FromMilliseconds(0);
-      params.sampling_interval = base::TimeDelta::FromMilliseconds(10);
-      params.samples_per_burst = duration / params.sampling_interval;
-      break;
-  }
-  return params;
-}
-
-bool StackSamplingConfiguration::IsProfilerEnabled() const {
-  return (configuration_ != PROFILE_DISABLED &&
-          configuration_ != PROFILE_CONTROL);
-}
-
-void StackSamplingConfiguration::RegisterSyntheticFieldTrial() const {
-  if (!IsProfilerSupported())
-    return;
-
-  std::string group;
-  switch (configuration_) {
-    case PROFILE_DISABLED:
-      group = "Disabled";
-      break;
-
-    case PROFILE_CONTROL:
-      group = "Control";
-      break;
-
-    case PROFILE_NO_SAMPLES:
-      group = "NoSamples";
-      break;
-
-    case PROFILE_5HZ:
-      group = "5Hz";
-      break;
-
-    case PROFILE_10HZ:
-      group = "10Hz";
-      break;
-
-    case PROFILE_100HZ:
-      group = "100Hz";
-      break;
-  }
-
-  ChromeMetricsServiceAccessor::RegisterSyntheticFieldTrial(
-      "SyntheticStackProfilingConfiguration",
-      group);
-}
-
-// static
-StackSamplingConfiguration::ProfileConfiguration
-StackSamplingConfiguration::GenerateConfiguration() {
-  if (!IsProfilerSupported())
-    return PROFILE_DISABLED;
-
-  // Enable the profiler in the intended ultimate production configuration for
-  // development/waterfall builds.
-  if (chrome::GetChannel() == version_info::Channel::UNKNOWN)
-    return PROFILE_10HZ;
-
-  // Enable according to the variations below in canary and dev.
-  if (chrome::GetChannel() == version_info::Channel::CANARY ||
-      chrome::GetChannel() == version_info::Channel::DEV) {
-    struct Variation {
-      ProfileConfiguration config;
-      int weight;
-    };
-
-    // Generate a configuration according to the associated weights.
-    const Variation variations[] = {
-      { PROFILE_10HZ, 100},
-      { PROFILE_CONTROL, 0},
-      { PROFILE_DISABLED, 0}
-    };
-
-    int total_weight = 0;
-    for (const Variation& variation : variations)
-      total_weight += variation.weight;
-    DCHECK_EQ(100, total_weight);
-
-    int chosen = base::RandInt(0, total_weight - 1);  // Max is inclusive.
-    int cumulative_weight = 0;
-    for (const Variation& variation : variations) {
-      if (chosen >= cumulative_weight &&
-          chosen < cumulative_weight + variation.weight) {
-        return variation.config;
-      }
-      cumulative_weight += variation.weight;
-    }
-    NOTREACHED();
-  }
-
-  return PROFILE_DISABLED;
-}