Tint task bar based on sampling of colors in the area

TODO: Add transition animation

Bug: 193938970
Test: manual
Change-Id: I0ffb94e0f11d47685a268ee8d057b6997f3a2ff6

quickstep/src/com/android/launcher3/taskbar/TaskbarStashController.java

@@ -284,6 +284,7 @@ public class TaskbarStashController {
             @Override
             public void onAnimationStart(Animator animation) {
                 mIsStashed = isStashed;
+                onIsStashed(mIsStashed);
             }
 
             @Override
@@ -325,4 +326,8 @@ public class TaskbarStashController {
                 animateForward ? UNSTASHED_TASKBAR_HANDLE_HINT_SCALE : 1)
                 .setDuration(TASKBAR_HINT_STASH_DURATION).start();
     }
+
+    private void onIsStashed(boolean isStashed) {
+        mControllers.stashedHandleViewController.onIsStashed(isStashed);
+    }
 }