Specify leading in sp units to it scales with the text.

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

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2015 The Chromium Authors. All rights reserved.
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
 <RelativeLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:chrome="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/snippets_card_view"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:foreground="@drawable/button_borderless_compat"
     android:padding="@dimen/snippets_padding"
     android:background="@drawable/card_single">
 
     <org.chromium.ui.widget.TextViewWithLeading
         android:id="@+id/article_headline"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_alignParentStart="true"
         android:layout_toStartOf="@+id/article_thumbnail"
         android:ellipsize="end"
         android:textSize="16sp"
         android:textColor="@color/snippets_headline_text_color"
-        chrome:leading="24dp" />
+        chrome:leading="24sp" />
 
     <org.chromium.ui.widget.TextViewWithLeading
         android:id="@+id/article_snippet"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_alignParentStart="true"
         android:layout_below="@+id/article_headline"
         android:layout_toStartOf="@+id/article_thumbnail"
         android:layout_marginTop="8dp"
         android:maxLines="2"
         android:ellipsize="end"
         android:textSize="14sp"
         android:textColor="@color/snippets_text_color"
-        chrome:leading="20dp" />
+        chrome:leading="20sp" />
 
     <LinearLayout
         tools:ignore="UseCompoundDrawables"
         android:id="@+id/publisher_bar"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginTop="@dimen/snippets_publisher_margin_top_with_article_snippet"
         android:layout_alignParentStart="true"
         android:layout_below="@+id/article_snippet"
         android:orientation="horizontal">
@@ skipping 49 matching lines @@
         android:id="@+id/article_thumbnail"
         android:layout_width="@dimen/snippets_thumbnail_size"
         android:layout_height="@dimen/snippets_thumbnail_size"
         android:layout_alignParentTop="true"
         android:layout_alignParentEnd="true"
         android:layout_marginStart="@dimen/snippets_thumbnail_margin"
         android:scaleType="centerCrop"
         android:contentDescription="@null"
         android:src="@null" />
 </RelativeLayout>