Add arguments to Widevine lshal debug hook.

Add options to dump Widevine Cdm properties,
Widevine Cdm metrics, or both.

The valid arguments are Cdm Metrics (m|M) or Cdm Properties (p|P).
If no arguments are provided, both Cdm properties and
Cdm metrics will be displayed.

Test: adb shell lshal debug [drm service] [m/p]
  adb shell lshal debug android.hardware.drm@1.3::IDrmFactory/widevine

Bug: 154027349
Change-Id: I95c10dd7d4274226936295c73be4eb1612c2ef6a

libwvdrmengine/include_hidl/wv_metrics.h

@@ -0,0 +1,14 @@
+// Copyright 2020 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine Master
+// License Agreement.
+//
+// Format widevine protobuf metrics
+
+#include <string>
+
+#include "metrics.pb.h"
+
+namespace wv_metrics {
+void FormatWvCdmMetrics(const drm_metrics::WvCdmMetrics& metrics,
+                        std::string& result);
+}