Ignore gestures on the scrim if hiding or hidden

Bug: 1108731
Change-Id: Ibbf6c03ad6c068c90ab356008c68878cb3d6604f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2316319Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791287}

components/browser_ui/widget/android/java/src/org/chromium/components/browser_ui/widget/scrim/ScrimMediator.java

@@ -215,6 +215,7 @@ class ScrimMediator implements View.OnClickListener, ScrimCoordinator.TouchEvent
 
     @Override
     public boolean onTouchEvent(MotionEvent e) {
+        if (mIsHidingOrHidden) return false;
         if (!mModel.getAllSetProperties().contains(ScrimProperties.GESTURE_DETECTOR)) return false;
 
         // Make sure the first event that goes through the filter is an ACTION_DOWN, even in the