[Launcher Jank] Avoid lock contention on AssetManager in all apps preinflate thread

Create a separate context with a separate AssetManager obj.

Bug: 337056120
Flag: NONE
Test: presubmit
Change-Id: Ic6765f7f19b649605aec6a889f8382ee10f929b0
diff --git a/src/com/android/launcher3/BaseActivity.java b/src/com/android/launcher3/BaseActivity.java
index 1049314..633091d 100644
--- a/src/com/android/launcher3/BaseActivity.java
+++ b/src/com/android/launcher3/BaseActivity.java
@@ -412,6 +412,8 @@
     public static <T extends BaseActivity> T fromContext(Context context) {
         if (context instanceof BaseActivity) {
             return (T) context;
+        } else if (context instanceof ActivityContextDelegate) {
+            return (T) ((ActivityContextDelegate) context).mDelegate;
         } else if (context instanceof ContextWrapper) {
             return fromContext(((ContextWrapper) context).getBaseContext());
         } else {