Move ParseConnection*() to connection_utils.

We don't need real_shill_provider if USE_DBUS is 0, but we still need
these functions, and they have a duplicate copy in connection_manager,
so put them in utils and deduplicate.

Also moved StringForConnectionType() to connection_utils.

Bug: 28800946
Test: mma

Change-Id: If535fdc52bc8fb267921bea02b31d8d6580d5d54
diff --git a/connection_utils.h b/connection_utils.h
new file mode 100644
index 0000000..e385517
--- /dev/null
+++ b/connection_utils.h
@@ -0,0 +1,51 @@
+//
+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef UPDATE_ENGINE_CONNECTION_UTILS_H_
+#define UPDATE_ENGINE_CONNECTION_UTILS_H_
+
+#include <string>
+
+namespace chromeos_update_engine {
+
+enum class ConnectionType {
+  kEthernet,
+  kWifi,
+  kWimax,
+  kBluetooth,
+  kCellular,
+  kUnknown
+};
+
+enum class ConnectionTethering {
+  kNotDetected,
+  kSuspected,
+  kConfirmed,
+  kUnknown,
+};
+
+namespace connection_utils {
+// Helper methods for converting shill strings into symbolic values.
+ConnectionType ParseConnectionType(const std::string& type_str);
+ConnectionTethering ParseConnectionTethering(const std::string& tethering_str);
+
+// Returns the string representation corresponding to the given connection type.
+const char* StringForConnectionType(ConnectionType type);
+}  // namespace connection_utils
+
+}  // namespace chromeos_update_engine
+
+#endif  // UPDATE_ENGINE_CONNECTION_UTILS_H_