[PCCT-SideSheet] No shadow margins during minimization

(cherry picked from commit 670de7a)

Bug: 1449946, 1434222
Change-Id: I79eaed742cea5f8e274dec50107f726b4201f0c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4569101
Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Kevin Grosu <kgrosu@google.com>
Commit-Queue: Zach Katz <katzz@google.com>
Cr-Original-Commit-Position: refs/heads/main@{#1150942}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4579830
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Kevin Grosu <kgrosu@google.com>
Auto-Submit: Zach Katz <katzz@google.com>
Cr-Commit-Position: refs/branch-heads/5790@{#228}
Cr-Branched-From: 1d71a33-refs/heads/main@{#1148114}

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

@@ -162,9 +162,6 @@ boolean toggleMaximize(boolean animate) {
         if (mIsMaximized) {
             if (shouldDrawDividerLine()) resetCoordinatorLayoutInsets();
             setTopMargins(0, 0);
-        } else {
-            if (shouldDrawDividerLine()) drawDividerLine();
-            updateShadowOffset();
         }
 
         AnimatorUpdateListener updateListener;
@@ -219,6 +216,8 @@ private void onMaximizeEnd() {
                     maybeResetTalkbackFocus();
                 }
                 initializeSize();
+                if (shouldDrawDividerLine()) drawDividerLine();
+                updateShadowOffset();
                 maybeInvokeResizeCallback();
             });
         }