Add a timeout waiting for contextual card loader.

- Intially setting it to 1 second.
- Also changed card appear animation from drop in to fade in. It looks
  less janky if we don't animate any size change.
- And some random code cleanup

Change-Id: I6e73bcf98fd9aa1d76ae002b94ab5b068dfecf1e
Fixes: 120916829
Test: robotests

src/com/android/settings/homepage/contextualcards/ContextualCardLoader.java

@@ -31,6 +31,7 @@ import android.database.Cursor;
 import android.net.Uri;
 import android.os.Handler;
 import android.os.Looper;
+import android.text.format.DateUtils;
 import android.util.Log;
 
 import androidx.annotation.NonNull;
@@ -49,6 +50,7 @@ public class ContextualCardLoader extends AsyncLoaderCompat<List<ContextualCard>
     @VisibleForTesting
     static final int DEFAULT_CARD_COUNT = 4;
     static final int CARD_CONTENT_LOADER_ID = 1;
+    static final long CARD_CONTENT_LOADER_TIMEOUT_MS = DateUtils.SECOND_IN_MILLIS;
 
     private static final String TAG = "ContextualCardLoader";