🔍 Continue working on the search widget prototype

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

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2017 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. -->
 
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
         android:id="@+id/control_container"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:background="#9affffff" >
+        android:background="@color/google_grey_500" >
 
     <!-- This view is unnecessary visually, but required for the LocationBarLayout. -->
     <org.chromium.chrome.browser.searchwidget.SearchActivityFadingBackgroundView
             android:id="@+id/fading_focus_target"
             android:layout_width="0dp"
             android:layout_height="0dp" />
 
     <ViewStub
             android:id="@+id/omnibox_results_container_stub"
             android:layout_width="match_parent"
@@ skipping 15 matching lines @@
             android:layout_width="match_parent"
             android:layout_height="@dimen/toolbar_height_no_shadow"
             android:background="@android:color/white"
             android:clickable="true" >
 
         <!-- TODO(dfalcantara): Ask UX about what to do for tablets. -->
         <org.chromium.chrome.browser.searchwidget.SearchActivityLocationBarLayout
                 android:id="@+id/search_location_bar"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
+                android:layout_gravity="center_vertical"
                 android:layout_marginStart="@dimen/tablet_toolbar_start_padding_no_buttons"
-                android:layout_marginEnd="@dimen/tablet_toolbar_start_padding_no_buttons"
-                android:layout_marginTop="@dimen/tablet_toolbar_start_padding_no_buttons" />
+                android:layout_marginEnd="@dimen/tablet_toolbar_start_padding_no_buttons" />
 
     </FrameLayout>
 
     <FrameLayout
             android:id="@+id/bottom_container"
             android:layout_width="match_parent"
             android:layout_height="match_parent" />
 
 </FrameLayout>