Move leak_detector_controller to its own directory

chrome/browser/metrics/leak_detector_controller.cc

-// Copyright 2016 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/metrics/leak_detector_controller.h"
-
-#include <algorithm>
-
-#include "base/logging.h"
-#include "base/strings/string_number_conversions.h"
-#include "components/variations/variations_associated_data.h"
-#include "content/public/browser/browser_thread.h"
-
-namespace metrics {
-
-namespace {
-
-// Reads parameters for the field trial variation. Any parameters not present in
-// the variation info or that cannot be parsed will be filled in with default
-// values. Returns a MemoryLeakReportProto with the parameter fields filled in.
-MemoryLeakReportProto::Params GetVariationParameters() {
-  // Variation parameter names.
-  const char kFieldTrialName[] = "RuntimeMemoryLeakDetector";
-  const char kSamplingRateParam[] = "sampling_rate";
-  const char kMaxStackDepthParam[] = "max_stack_depth";
-  const char kAnalysisIntervalKbParam[] = "analysis_interval_kb";
-  const char kSizeSuspicionThresholdParam[] = "size_suspicion_threshold";
-  const char kCallStackSuspicionThresholdParam[] =
-      "call_stack_suspicion_threshold";
-
-  // Default parameter values.
-  double kDefaultSamplingRate = 1.0f / 256;
-  size_t kDefaultMaxStackDepth = 4;
-  uint64_t kDefaultAnalysisIntervalKb = 32768;
-  uint32_t kDefaultSizeSuspicionThreshold = 4;
-  uint32_t kDefaultCallStackSuspicionThreshold = 4;
-
-  double sampling_rate = 0;
-  size_t max_stack_depth = 0;
-  uint64_t analysis_interval_kb = 0;
-  uint32_t size_suspicion_threshold = 0;
-  uint32_t call_stack_suspicion_threshold = 0;
-
-  // Get a mapping of param names to param values.
-  std::map<std::string, std::string> params;
-  variations::GetVariationParams(kFieldTrialName, &params);
-
-  // Even if the variation param data does not exist and |params| ends up empty,
-  // the below code will assign default values.
-  auto iter = params.find(kSamplingRateParam);
-  if (iter == params.end() ||
-      !base::StringToDouble(iter->second, &sampling_rate)) {
-    sampling_rate = kDefaultSamplingRate;
-  }
-
-  iter = params.find(kMaxStackDepthParam);
-  if (iter == params.end() ||
-      !base::StringToSizeT(iter->second, &max_stack_depth)) {
-    max_stack_depth = kDefaultMaxStackDepth;
-  }
-
-  iter = params.find(kAnalysisIntervalKbParam);
-  if (iter == params.end() ||
-      !base::StringToUint64(iter->second, &analysis_interval_kb)) {
-    analysis_interval_kb = kDefaultAnalysisIntervalKb;
-  }
-
-  iter = params.find(kSizeSuspicionThresholdParam);
-  if (iter == params.end() ||
-      !base::StringToUint(iter->second, &size_suspicion_threshold)) {
-    size_suspicion_threshold = kDefaultSizeSuspicionThreshold;
-  }
-
-  iter = params.find(kCallStackSuspicionThresholdParam);
-  if (iter == params.end() ||
-      !base::StringToUint(iter->second, &call_stack_suspicion_threshold)) {
-    call_stack_suspicion_threshold = kDefaultCallStackSuspicionThreshold;
-  }
-
-  MemoryLeakReportProto_Params result;
-  result.set_sampling_rate(sampling_rate);
-  result.set_max_stack_depth(max_stack_depth);
-  result.set_analysis_interval_bytes(analysis_interval_kb * 1024);
-  result.set_size_suspicion_threshold(size_suspicion_threshold);
-  result.set_call_stack_suspicion_threshold(call_stack_suspicion_threshold);
-  return result;
-}
-
-}  // namespace
-
-LeakDetectorController::LeakDetectorController()
-    : params_(GetVariationParameters()) {
-  LeakDetector* detector = LeakDetector::GetInstance();
-  detector->AddObserver(this);
-
-  // Leak detector parameters are stored in |params_|.
-  detector->Init(params_, content::BrowserThread::GetMessageLoopProxyForThread(
-                              content::BrowserThread::UI));
-}
-
-LeakDetectorController::~LeakDetectorController() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  LeakDetector::GetInstance()->RemoveObserver(this);
-}
-
-void LeakDetectorController::OnLeaksFound(
-    const std::vector<MemoryLeakReportProto>& reports) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-
-  for (const auto& report : reports) {
-    // Store the report and insert stored parameters.
-    stored_reports_.push_back(report);
-    stored_reports_.back().mutable_params()->CopyFrom(params_);
-  }
-}
-
-void LeakDetectorController::GetLeakReports(
-    std::vector<MemoryLeakReportProto>* reports) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  *reports = std::move(stored_reports_);
-}
-
-}  // namespace metrics