Simplifying color extraction registration logic

> Calulating correct location irrespective of transient
  state (scale/translation)
> Removing extraction pause/resume logic
> Simplifying location calculation and registration (only use one location instead of a list)

Bug: 194732483
Test: Manual
Change-Id: I255d83761bff5e09c9fb0a5e398d0be0c1d0956f

src/com/android/launcher3/ButtonDropTarget.java

@@ -217,7 +217,6 @@ public abstract class ButtonDropTarget extends TextView
         final DragView dragView = d.dragView;
         final Rect to = getIconRect(d);
         final float scale = (float) to.width() / dragView.getMeasuredWidth();
-        dragView.disableColorExtraction();
         dragView.detachContentView(/* reattachToPreviousParent= */ true);
         mDropTargetBar.deferOnDragEnd();
 
@@ -225,9 +224,6 @@ public abstract class ButtonDropTarget extends TextView
             completeDrop(d);
             mDropTargetBar.onDragEnd();
             mLauncher.getStateManager().goToState(NORMAL);
-            // Only re-enable updates once the workspace is back to normal, which will be after the
-            // current frame.
-            post(dragView::resumeColorExtraction);
         };
 
         dragLayer.animateView(d.dragView, to, scale, 0.1f, 0.1f,