Prevent setting launcher layer has opaque when there is content behind

- This can prevent the layered content behind to not be visible (and
  since launcher draws a cutout and the wallpaper isn't shown, may
  result in a black rect.  We only specialize for this case while
  Launcher is in Overview.
- Also don't need to defer updating drawsBelowRecents, this can result
  in the state not being reflected since it runs after the last update
  of the transform params

Bug: 205789573
Test: Swipe up from app and ensure behind layers are visible (also
      ensure this doesn't affect blur during the swipe or optimizations
      after you leave overview)
Change-Id: I07689b3d9b65708797576e5fbefe12fb1f544119

quickstep/src/com/android/launcher3/uioverrides/RecentsViewStateController.java

@@ -63,6 +63,9 @@ public final class RecentsViewStateController extends
         }
         setAlphas(PropertySetter.NO_ANIM_PROPERTY_SETTER, new StateAnimationConfig(), state);
         mRecentsView.setFullscreenProgress(state.getOverviewFullscreenProgress());
+        // In Overview, we may be layering app surfaces behind Launcher, so we need to notify
+        // DepthController to prevent optimizations which might occlude the layers behind
+        mLauncher.getDepthController().setHasContentBehindLauncher(state.overviewUi);
     }
 
     @Override
@@ -78,6 +81,10 @@ public final class RecentsViewStateController extends
             builder.addListener(
                     AnimatorListeners.forSuccessCallback(mRecentsView::resetTaskVisuals));
         }
+        // In Overview, we may be layering app surfaces behind Launcher, so we need to notify
+        // DepthController to prevent optimizations which might occlude the layers behind
+        builder.addListener(AnimatorListeners.forSuccessCallback(() ->
+                mLauncher.getDepthController().setHasContentBehindLauncher(toState.overviewUi)));
 
         // Create or dismiss split screen select animations
         LauncherState currentState = mLauncher.getStateManager().getState();