Make msys database available in Flipper Database plugin

Summary:
DefaultSqliteDatabaseProvider only list databases in the "files" folder & "databases" folder:
/data/user/0/com.facebook.wakizashi/files/
/data/user/0/com.facebook.wakizashi/databases/

On Messenger in Blue, msys database is located in the folder /data/data/com.facebook.wakizashi/app_mib_msys and therefore is not found automatically.

This patch makes the Database Flipper dolphin see the msys database by also listing the databases referred via extraDatabaseFiles.

Differential Revision: D35041276

fbshipit-source-id: e91b95fdc3bb31d414087cdea4a6825a98f3210a

android/src/main/java/com/facebook/flipper/plugins/databases/impl/DefaultSqliteDatabaseProvider.java

@@ -18,6 +18,7 @@ public class DefaultSqliteDatabaseProvider implements SqliteDatabaseProvider {
 
   private final int fileDirectoryRecursiveDepth;
   private final Context context;
+  private static final List<File> extraDatabaseFiles = new ArrayList<>();
 
   public DefaultSqliteDatabaseProvider(Context context) {
     this(context, MAX_RECURSIVE_TRAVERSAL_DEPTH);
@@ -40,6 +41,9 @@ public class DefaultSqliteDatabaseProvider implements SqliteDatabaseProvider {
         DB_EXTENSION,
         fileDirectoryRecursiveDepth,
         databaseFiles);
+    synchronized (extraDatabaseFiles) {
+      databaseFiles.addAll(extraDatabaseFiles);
+    }
     return databaseFiles;
   }
 
@@ -59,4 +63,10 @@ public class DefaultSqliteDatabaseProvider implements SqliteDatabaseProvider {
       }
     }
   }
+
+  public static void registerExtraDatabaseFile(File file) {
+    synchronized (extraDatabaseFiles) {
+      extraDatabaseFiles.add(file);
+    }
+  }
 }