[REFACTOR] Split Android and CrOS logging.
Previously, they are all cramped in main.cc. Split them
into their respective files logging.cc, logging_android.cc
and provide a common header, logging.h, that main.cc can use.
Bug: 147696014
Bug: 148818798
Test: builds
Test: build logging.cc in Android
Change-Id: Iafdaee6be20e204f4faa1d1d8f81e43670f08d96
diff --git a/logging.h b/logging.h
new file mode 100644
index 0000000..c9e7483
--- /dev/null
+++ b/logging.h
@@ -0,0 +1,23 @@
+//
+// Copyright (C) 2020 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.
+//
+
+namespace chromeos_update_engine {
+
+// Set up logging. |log_to_system| and |log_to_file| specifies
+// the destination of logs.
+void SetupLogging(bool log_to_system, bool log_to_file);
+
+} // namespace chromeos_update_engine