Add feature for condensed NTP tiles.

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

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2016 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. -->
 <org.chromium.chrome.browser.ntp.NewTabPageLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:chrome="http://schemas.android.com/apk/res-auto"
     android:id="@+id/ntp_content"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ skipping 86 matching lines @@
     </LinearLayout>
 
     <!-- Middle spacer -->
     <View
         android:id="@+id/ntp_middle_spacer"
         android:layout_width="0dp"
         android:layout_height="0dp"
         android:layout_weight="0"
         android:visibility="invisible" />
 
-    <!-- Site suggestion tiles -->
+    <!-- Site suggestion tile grid -->
     <org.chromium.chrome.browser.suggestions.TileGridLayout
         android:id="@+id/tile_grid_layout"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginBottom="16dp"
         android:layout_marginStart="12dp"
         android:layout_marginEnd="12dp"
         android:layout_gravity="center_horizontal"
         android:paddingTop="@dimen/tile_grid_layout_padding_top"
         android:paddingBottom="4dp" />
 
-    <!-- Site suggestions tile grid placeholder -->
+    <!-- Site suggestion tile grid placeholder -->
     <ViewStub
         android:id="@+id/tile_grid_placeholder_stub"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_weight="1"
         android:inflatedId="@+id/tile_grid_placeholder"
         android:layout="@layout/new_tab_page_tile_grid_placeholder" />
 
     <!-- Bottom spacer -->
     <View
         android:id="@+id/ntp_bottom_spacer"
         android:layout_width="0dp"
         android:layout_height="0dp"
         android:layout_weight="0"
         android:visibility="invisible" />
 
     <!-- Spacer for when there is no search provider logo. -->
     <View
         android:id="@+id/no_search_logo_spacer"
         android:layout_width="match_parent"
         android:layout_height="0dp"
         android:layout_weight="1"
         android:visibility="gone" />
 </org.chromium.chrome.browser.ntp.NewTabPageLayout>