Build metrics_dump tool in Android.

Replace Makefile with Android.bp.
Remove duplication of protos in proto directory.

Since we are now building the metrics_dump tool
under Android, use frameworks metrics.proto
directly. Also, reference cdm's wv_metrics.proto
from the cdm directory instead of creating a
subset in proto directory.

bug: 161783052
bug: 170607430

Test: build
  m -j128 metrics_dump
Test: metrics_dump [bugreport from adt-3-r.zip]
Test: metrics_dump [bugreport from sabrina-q.gz]
Test: metrics_dump --widevine [adb shell dumpsys media.metrics output]
Change-Id: I82c7e723453ac2a6335cb2bb732a376d535b9ea3

libwvdrmengine/cdm/metrics/src/Android.bp

@@ -1,10 +1,47 @@
-cc_library {
+// 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.
 
-    name: "libcdm_metrics_protos",
+// Build host library for metrics_dump tool.
+cc_library_host_shared {
+
+    name: "libcdm_metrics_protos_full_host",
     vendor: true,
 
+    include_dirs: ["external/protobuf/src"],
+
     srcs: [
-      "wv_metrics.proto",
+        "wv_metrics.proto",
+    ],
+
+    cflags: [
+        "-Wall",
+        "-Werror",
+    ],
+
+    proto: {
+        export_proto_headers: true,
+        type: "full",
+    },
+}
+
+cc_library {
+
+    name: "libcdm_metrics_protos",
+    vendor: true,
+
+    srcs: [
+        "wv_metrics.proto",
     ],
 
     cflags: [
@@ -16,5 +53,4 @@ cc_library {
         export_proto_headers: true,
         type: "full",
     },
-
 }