Add empty TextView to preload Google Sans on FRE

Seems fonts are only loaded when it is needed. Adding empty text view to
load Google Sans to "preload" for following pages.

More context in the original bug.

Bug: 1119990
Change-Id: I026b80cf15b939c30f97a1174aad4d8259ef66b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427524Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: Sky Malice <skym@chromium.org>
Commit-Queue: Wenyu Fu <wenyufu@chromium.org>
Auto-Submit: Wenyu Fu <wenyufu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810024}

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

@@ -144,4 +144,12 @@
         android:layout_gravity="bottom|center"
         android:text="@string/fre_browser_managed_by_organization"
         android:visibility="gone"/>
+
+    <!-- Empty TextView to preload fonts for following pages. See https://crbug.com/1119990#c20 -->
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:textAppearance="@style/TextAppearance.Headline.Primary"
+        android:visibility="gone"/>
+
 </org.chromium.chrome.browser.firstrun.TosAndUmaFragmentView>