Record MetricsService's execution phase to the stability file

components/browser_watcher/stability_debugging_win.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 "components/browser_watcher/stability_debugging_win.h"
-
-#include <string>
-
-#include "base/feature_list.h"
-#include "base/files/file.h"
-#include "base/metrics/persistent_memory_allocator.h"
-#include "base/path_service.h"
-#include "base/process/process.h"
-#include "base/strings/stringprintf.h"
-#include "base/time/time.h"
-#include "components/browser_watcher/features.h"
-
-namespace browser_watcher {
-
-namespace {
-
-bool GetCreationTime(const base::Process& process, base::Time* time) {
-  DCHECK(time);
-
-  FILETIME creation_time = {};
-  FILETIME ignore1 = {};
-  FILETIME ignore2 = {};
-  FILETIME ignore3 = {};
-  if (!::GetProcessTimes(process.Handle(), &creation_time, &ignore1, &ignore2,
-                         &ignore3)) {
-    return false;
-  }
-  *time = base::Time::FromFileTime(creation_time);
-  return true;
-}
-
-}  // namespace
-
-base::FilePath GetStabilityDir(const base::FilePath& user_data_dir) {
-  return user_data_dir.AppendASCII("Stability");
-}
-
-bool GetStabilityFileForProcess(const base::Process& process,
-                                const base::FilePath& user_data_dir,
-                                base::FilePath* file_path) {
-  DCHECK(file_path);
-  base::FilePath stability_dir = GetStabilityDir(user_data_dir);
-
-  // Build the name using the pid and creation time. On windows, this is unique
-  // even after the process exits.
-  base::Time creation_time;
-  if (!GetCreationTime(process, &creation_time))
-    return false;
-
-  std::string file_name =
-      base::StringPrintf("%u-%llu", process.Pid(), creation_time.ToJavaTime());
-  *file_path = stability_dir.AppendASCII(file_name).AddExtension(
-      base::PersistentMemoryAllocator::kFileExtension);
-  return true;
-}
-
-base::FilePath::StringType GetStabilityFilePattern() {
-  return base::FilePath::StringType(FILE_PATH_LITERAL("*-*")) +
-         base::PersistentMemoryAllocator::kFileExtension;
-}
-
-void MarkStabilityFileForDeletion(const base::FilePath& user_data_dir) {
-  if (!base::FeatureList::IsEnabled(
-          browser_watcher::kStabilityDebuggingFeature)) {
-    return;
-  }
-
-  base::FilePath stability_file;
-  if (!GetStabilityFileForProcess(base::Process::Current(), user_data_dir,
-                                  &stability_file)) {
-    // TODO(manzagop): add a metric for this.
-    return;
-  }
-
-  // Open (with delete) and then immediately close the file by going out of
-  // scope. This should cause the stability debugging file to be deleted prior
-  // to the next execution.
-  base::File file(stability_file, base::File::FLAG_OPEN |
-                                      base::File::FLAG_READ |
-                                      base::File::FLAG_DELETE_ON_CLOSE);
-}
-
-}  // namespace browser_watcher