Add bugreport section progress reporter

- Allow dumpstatelisteners to monitor section size and duration and errors while the
bugreport is generated. Data will be used to write smoke tests for bugreport.
- Refactor main function to allow test to call dumpstate main function. Required until
bugreport api is completed
- Restore stdout and stderr fds before exiting dumpstate

Bug: 70154685
Test: mmm -j56 frameworks/native/cmds/dumpstate && \
      adb sync data && \
      adb shell /data/nativetest64/dumpstate_test/dumpstate_test && \
      printf "\n\n#### ALL TESTS PASSED ####\n"

Change-Id: I7e0938baf6e055f14dce2348d0fe99f261870bf1
diff --git a/cmds/dumpstate/main.cpp b/cmds/dumpstate/main.cpp
new file mode 100644
index 0000000..78aad11
--- /dev/null
+++ b/cmds/dumpstate/main.cpp
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+
+#include "dumpstate.h"
+
+int main(int argc, char* argv[]) {
+    return run_main(argc, argv);
+}