Add logging to help debug loader issue.

Sometimes, it looks like the loader is not returning the result
to populate the storage settings view. The current bug reports
have no smoking guns. By adding this debug logging to the build,
the bug reports should hopefully help lead us to where the bug
is originating.

Bug: 35389719
Test: None
Change-Id: Ifa3f69f1fb4669aa72e6ef9c7ccc9d74b9e0fa71

src/com/android/settings/deviceinfo/storage/StorageAsyncLoader.java

@@ -26,6 +26,7 @@ import android.os.UserHandle;
 import android.util.ArrayMap;
 import android.util.ArraySet;
 import android.util.SparseArray;
+import android.util.Log;
 
 import com.android.settings.applications.PackageManagerWrapper;
 import com.android.settings.applications.UserManagerWrapper;
@@ -42,6 +43,8 @@ import java.util.Map;
 public class StorageAsyncLoader
         extends AsyncLoader<SparseArray<StorageAsyncLoader.AppsStorageResult>> {
     private UserManagerWrapper mUserManager;
+    private static final String TAG = "StorageAsyncLoader";
+
     private String mUuid;
     private StorageStatsSource mStatsManager;
     private PackageManagerWrapper mPackageManager;
@@ -71,6 +74,7 @@ public class StorageAsyncLoader
     }
 
     private AppsStorageResult getStorageResultForUser(int userId) {
+        Log.d(TAG, "Loading apps");
         List<ApplicationInfo> applicationInfos =
                 mPackageManager.getInstalledApplicationsAsUser(0, userId);
         ArraySet<Integer> seenUid = new ArraySet<>(); // some apps share a uid
@@ -98,7 +102,9 @@ public class StorageAsyncLoader
             }
         }
 
+        Log.d(TAG, "Loading external stats");
         result.externalStats = mStatsManager.getExternalStorageStats(mUuid, UserHandle.of(userId));
+        Log.d(TAG, "Obtaining result completed");
         return result;
     }