Move some basic early process init into Service Manager

services/service_manager/public/cpp/lib/shared_file_util.cc

-// Copyright 2017 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 "services/service_manager/public/cpp/shared_file_util.h"
-
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_split.h"
-
-namespace service_manager {
-
-void SharedFileSwitchValueBuilder::AddEntry(const std::string& key_str,
-                                            int key_id) {
-  if (!switch_value_.empty()) {
-    switch_value_ += ",";
-  }
-  switch_value_ += key_str, switch_value_ += ":";
-  switch_value_ += base::IntToString(key_id);
-}
-
-base::Optional<std::map<int, std::string>> ParseSharedFileSwitchValue(
-    const std::string& value) {
-  std::map<int, std::string> values;
-  std::vector<std::string> string_pairs = base::SplitString(
-      value, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
-  for (const auto& pair : string_pairs) {
-    size_t colon_position = pair.find(":");
-    if (colon_position == std::string::npos || colon_position == 0 ||
-        colon_position == pair.size() - 1) {
-      DLOG(ERROR) << "Found invalid entry parsing shared file string value:"
-                  << pair;
-      return base::nullopt;
-    }
-    std::string key = pair.substr(0, colon_position);
-    std::string number_string =
-        pair.substr(colon_position + 1, std::string::npos);
-    int key_int;
-    if (!base::StringToInt(number_string, &key_int)) {
-      DLOG(ERROR) << "Found invalid entry parsing shared file string value:"
-                  << number_string << " (not an int).";
-      return base::nullopt;
-    }
-
-    values[key_int] = key;
-  }
-  return base::make_optional(std::move(values));
-}
-
-}  // namespace service_manager