Files required by a service now listed in manifest.

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

Index: services/service_manager/public/cpp/lib/shared_file_util.cc
diff --git a/services/service_manager/public/cpp/lib/shared_file_util.cc b/services/service_manager/public/cpp/lib/shared_file_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f996ed8a3c64a66c4bb3fe58e16ae018b8e03f4f
--- /dev/null
+++ b/services/service_manager/public/cpp/lib/shared_file_util.cc
@@ -0,0 +1,49 @@
+// 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