Early exit if ScrimCoordinator#hideScrim called multiple times

Bug: 1135465
Change-Id: I3202884bcaaa9c80c6d6b3940da77c717f54b357
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2459108Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817665}

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

@@ -107,6 +107,10 @@ class ScrimMediator implements ScrimCoordinator.TouchEventDelegate {
      */
     void hideScrim(boolean animate) {
         assert mModel != null : "#hideScrim(...) was called on an inactive scrim!";
+        if (mIsHidingOrHidden) {
+            if (mOverlayAnimator != null && !animate) mOverlayAnimator.end();
+            return;
+        }
 
         if (mOverlayFadeOutAnimator == null) {
             mOverlayFadeOutAnimator = ValueAnimator.ofFloat(1, 0);