Add foundation for automated performance tests.

app/src/main/java/org/thoughtcrime/securesms/keyvalue/KeyValueStore.java

@@ -6,6 +6,7 @@ import android.content.Context;
 import androidx.annotation.AnyThread;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
 import androidx.annotation.WorkerThread;
 
 import org.signal.core.util.concurrent.SignalExecutors;
@@ -126,6 +127,15 @@ public final class KeyValueStore implements KeyValueReader {
     }
   }
 
+  /**
+   * Forces the store to re-fetch all of it's data from the database.
+   * Should only be used for testing!
+   */
+  @VisibleForTesting
+  synchronized void resetCache() {
+    dataSet = null;
+    initializeIfNecessary();
+  }
 
   private synchronized void write(@NonNull KeyValueDataSet newDataSet, @NonNull Collection<String> removes) {
     initializeIfNecessary();

app/src/main/java/org/thoughtcrime/securesms/keyvalue/SignalStore.java

@@ -1,9 +1,9 @@
 package org.thoughtcrime.securesms.keyvalue;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.VisibleForTesting;
 import androidx.preference.PreferenceDataStore;
 
-import org.thoughtcrime.securesms.database.model.databaseprotos.Wallpaper;
 import org.thoughtcrime.securesms.dependencies.ApplicationDependencies;
 import org.thoughtcrime.securesms.util.SignalUncaughtExceptionHandler;
 
@@ -70,6 +70,15 @@ public final class SignalStore {
     proxy().onFirstEverAppLaunch();
   }
 
+  /**
+   * Forces the store to re-fetch all of it's data from the database.
+   * Should only be used for testing!
+   */
+  @VisibleForTesting
+  public static void resetCache() {
+    INSTANCE.store.resetCache();
+  }
+
   public static @NonNull KbsValues kbsValues() {
     return INSTANCE.kbsValues;
   }