Android: Extra margin between title and the icon for Preview Tab

This CL increases margin between the tiel and RHS icon in
preview tab.

Bug: 1047890
Change-Id: I96fcbd68b25a467c13a525d94c17976184812959
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032699Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737929}

chrome/android/java/res/layout/sheet_tab_toolbar.xml

@@ -77,6 +77,7 @@
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginTop="16dp"
+                android:layout_marginEnd="16dp"
                 android:layout_toStartOf="@id/open_in_new_tab"
                 android:layout_toEndOf="@id/favicon"
                 android:textAlignment="viewStart"