Explicit Nullbility in Launcher (Part 2)

This CL updates the nullabality on methods associated with IconCache in Launcher.

Bug: 242895652
Test: manual
Change-Id: I4832c0950141c8a52c8a9e62659ccabb082897c8

src/com/android/launcher3/icons/ComponentWithLabel.java

@@ -20,6 +20,8 @@ import android.content.Context;
 import android.content.pm.PackageManager;
 import android.os.UserHandle;
 
+import androidx.annotation.NonNull;
+
 import com.android.launcher3.icons.cache.CachingLogic;
 
 public interface ComponentWithLabel {
@@ -42,22 +44,26 @@ public interface ComponentWithLabel {
         }
 
         @Override
-        public ComponentName getComponent(T object) {
+        @NonNull
+        public ComponentName getComponent(@NonNull T object) {
             return object.getComponent();
         }
 
+        @NonNull
         @Override
-        public UserHandle getUser(T object) {
+        public UserHandle getUser(@NonNull T object) {
             return object.getUser();
         }
 
+        @NonNull
         @Override
-        public CharSequence getLabel(T object) {
+        public CharSequence getLabel(@NonNull T object) {
             return object.getLabel(mPackageManager);
         }
 
+        @NonNull
         @Override
-        public BitmapInfo loadIcon(Context context, T object) {
+        public BitmapInfo loadIcon(@NonNull Context context, @NonNull T object) {
             return BitmapInfo.LOW_RES_INFO;
         }