Use minHeight for accessibility text scaling preference

Use a minHeight instead of a layout_height for the accessibility
text scaling prefence so that text doesn't get cut off.

BUG=907366

Change-Id: Ieb25e34ef0104a50f94901aebbc5b232600d49c2
Reviewed-on: https://chromium-review.googlesource.com/c/1387692Reviewed-by: Becky Zhou <huayinz@chromium.org>
Commit-Queue: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619486}

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

@@ -32,12 +32,13 @@
     <TextView
         android:id="@+id/preview"
         android:layout_width="match_parent"
-        android:layout_height="180dp"
+        android:layout_height="wrap_content"
+        android:minHeight="180dp"
         android:layout_marginTop="10dp"
         android:background="#fafafa"
         android:padding="16dp"
         android:text="@string/font_size_preview_text"
-        android:textColor="?android:attr/textColorPrimary"
+        android:textAppearance="@style/TextAppearance.AccessibilityTextPreference"
         android:lineSpacingExtra="6dp" />
 
 </LinearLayout>
\ No newline at end of file

chrome/android/java/res/values-v17/styles.xml

@@ -201,6 +201,9 @@
         <item name="android:layout_marginTop">2dp</item>
         <item name="android:background">@color/modern_grey_600</item>
     </style>
+    <style name="TextAppearance.AccessibilityTextPreference">
+        <item name="android:textColor">?android:attr/textColorPrimary</item>
+    </style>
 
     <style name="ThemeWithActionBarBase" parent="Theme.AppCompat.Light">
         <item name="android:windowBackground">@drawable/action_bar_activity_bg</item>