Output metrics in YAML format

Merge from http://go/wvgerrit/158917

Use go/yamllint as reference and obfuscate portion of output to
run on an online yaml validator.

Sample output: http://go/cl/481370906

Test: Netflix, Play TV and Movies, Youtube
Test: adb shell dumpsys android.hardware.drm.IDrmFactory/widevine
Test: ./build_and_run_all_unit_tests.sh

Bug: 239462891
Change-Id: I1abf1aa50aa25b97b1f6c10995c324d6de04d056

libwvdrmengine/cdm/util/include/error_string_util.h

@@ -0,0 +1,11 @@
+#ifndef ERROR_STRING_UTIL_H_
+#define ERROR_STRING_UTIL_H_
+
+#include <string>
+
+namespace wvutil {
+
+const std::string OEMCryptoResultToString(int oemcrypto_result);
+
+}  // namespace wvutil
+#endif  // ERROR_STRING_UTIL_H_