Fixing Clear-all button being positioned incorrectly

Positioning used mClearAllButton.getTop(), which wasn't set until first
layout.

Bug: 72222505
Test: Manual
Change-Id: I6f60067fe6446e2359c3598084064f2df0673f47

quickstep/src/com/android/quickstep/views/RecentsViewContainer.java

@@ -75,8 +75,8 @@ public class RecentsViewContainer extends InsettableFrameLayout {
     }
 
     @Override
-    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
-        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        super.onLayout(changed, left, top, right, bottom);
 
         mRecentsView.getTaskSize(mTempRect);