Show a Google "G" in the omnibox on the New Tab Page.

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 59 matching lines @@
         android:paddingEnd="2dp"
         android:paddingTop="3dp"
         android:paddingBottom="3dp" >
         <EditText
             android:id="@+id/search_box_text"
             android:layout_width="0dp"
             android:layout_height="match_parent"
             android:layout_marginStart="12dp"
             android:layout_weight="1"
             android:background="@null"
+            android:drawableStart="@drawable/googleg"
+            android:drawablePadding="8dp"
             android:ellipsize="end"
             android:focusableInTouchMode="false"
             android:gravity="center_vertical"
             android:inputType="text"
             android:singleLine="true"
             android:textSize="@dimen/location_bar_url_text_size"
             android:textColorHint="@color/ntp_search_box_hint" />
         <org.chromium.chrome.browser.widget.TintedImageView
             android:id="@+id/voice_search_button"
             android:layout_width="wrap_content"
@@ skipping 42 matching lines @@
         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>