Enable trim memory callbacks to the loader, background task preloading

- Also enable the high-res thumbnail loader

Bug: 73651529

Change-Id: Ic23997f10289ea10cb1f41104e07029c9102c
Signed-off-by: Winson Chung <winsonc@google.com>
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 5ac53a8..38b0140 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -829,6 +829,7 @@
             mScrimAnimator.start();
         }
         mShouldFadeInScrim = false;
+        UiFactory.onStart(this);
     }
 
     @Override
@@ -2171,6 +2172,7 @@
         if (mLauncherCallbacks != null) {
             mLauncherCallbacks.onTrimMemory(level);
         }
+        UiFactory.onTrimMemory(this, level);
     }
 
     @Override