Add (2nd) empty TextView to preload Google Sans on FRE

Same implementation as crrev.com/c/2427524.
Adding another empty text view to load Google Sans that used for FRE buttons.

More context in the original bug.

Bug: 1119990
Change-Id: Ic4820db06b635237ece07d1780d7188aaeb85796
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437369
Auto-Submit: Wenyu Fu <wenyufu@chromium.org>
Reviewed-by: Sky Malice <skym@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Theresa  <twellington@chromium.org>
Commit-Queue: Wenyu Fu <wenyufu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811947}

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

@@ -151,5 +151,10 @@
         android:layout_height="wrap_content"
         android:textAppearance="@style/TextAppearance.Headline.Primary"
         android:visibility="gone"/>
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:textAppearance="@style/TextAppearance.Button.Text.Filled"
+        android:visibility="gone"/>
 
 </org.chromium.chrome.browser.firstrun.TosAndUmaFragmentView>