[Pcct-SideSheet] Get rid of flashing glitch in maximization

A regression due to the content visibility control using View.GONE
caused flashing glitch at the beginning/end of maximization.
This CL mitigates that. The content becomes hidden with
View.INVISIBLE but View.GONE is inserted during the animation.
This can both prevent the sluggish resizing and hide the flash.

(cherry picked from commit 420ef91)

Bug: 1451233
Change-Id: I076230554f598396ffa7cde90594f0e99c3b33a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4598627
Reviewed-by: Kevin Grosu <kgrosu@google.com>
Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1154468}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4608523
Cr-Commit-Position: refs/branch-heads/5790@{#656}
Cr-Branched-From: 1d71a33-refs/heads/main@{#1148114}

chrome/android/java/src/org/chromium/chrome/browser/customtabs/features/partialcustomtab/PartialCustomTabSideSheetStrategy.java

@@ -181,7 +181,12 @@ boolean toggleMaximize(boolean animate) {
         } else {
             start = windowLayout.width;
             end = mIsMaximized ? displayWidth : clampedInitialWidth;
-            updateListener = (anim) -> setWindowWidth((int) anim.getAnimatedValue());
+            View content = (ViewGroup) mActivity.findViewById(R.id.compositor_view_holder);
+            updateListener = (anim) -> {
+                // Switch the invisibility type to GONE to prevent sluggish resizing artifacts.
+                if (content.getVisibility() != View.GONE) content.setVisibility(View.GONE);
+                setWindowWidth((int) anim.getAnimatedValue());
+            };
         }
         // Keep the WebContents invisible during the animation to hide the jerky visual artifacts
         // of the contents due to resizing.
@@ -203,6 +208,7 @@ private void setContentVisible(boolean visible) {
     }
 
     private void onMaximizeEnd() {
+        setContentVisible(false);
         if (isMaximized()) {
             if (mSheetOnRight) {
                 configureLayoutBeyondScreen(false);