Add proguard to nearby service target.

Also fixed a few minor issues.

Bug: 189355156
Test: install on sunfish && atest NearbyUnitTests
Change-Id: I8f5cc990e69940a48fdad24713015690bdc6d3cd
diff --git a/nearby/service/Android.bp b/nearby/service/Android.bp
index 5b026fa..13dd6a9 100644
--- a/nearby/service/Android.bp
+++ b/nearby/service/Android.bp
@@ -43,6 +43,7 @@
     optimize: {
         enabled: true,
         shrink: true,
+        proguard_flags_files: ["proguard.flags"],
     },
     dex_preopt: {
         enabled: false,
diff --git a/nearby/service/java/com/android/server/nearby/NearbyService.java b/nearby/service/java/com/android/server/nearby/NearbyService.java
index 5647a4d..d0d7c94 100644
--- a/nearby/service/java/com/android/server/nearby/NearbyService.java
+++ b/nearby/service/java/com/android/server/nearby/NearbyService.java
@@ -17,15 +17,19 @@
 package com.android.server.nearby;
 
 import android.content.Context;
+import android.util.Log;
 
 import com.android.server.SystemService;
 
 /**
  * Service implementing nearby functionality. The actual implementation is delegated to
- * {@link NearbyDeviceScanServiceImpl}.
+ * {@link NearbyServiceImpl}.
  */
 // TODO(189954300): Implement nearby service.
 public class NearbyService extends SystemService {
+    private static final String TAG = "NearbyService";
+    private static final boolean DBG = true;
+
     private final NearbyServiceImpl mImpl;
 
     public NearbyService(Context contextBase) {
@@ -35,6 +39,10 @@
 
     @Override
     public void onStart() {
+        if (DBG) {
+            Log.d(TAG, "Publishing NearbyService");
+        }
+
     }
 
     @Override
diff --git a/nearby/service/proguard.flags b/nearby/service/proguard.flags
new file mode 100644
index 0000000..55c963f
--- /dev/null
+++ b/nearby/service/proguard.flags
@@ -0,0 +1,5 @@
+# Prevent proguard from stripping out any nearby-service.
+# TODO: This could be optimized in the future to only keep the critical
+# entry points and then let proguard strip out any unused code within
+# the service.
+-keep class com.android.server.nearby.** { *; }