Stop UI jumping when clicking Contextual Search Results in Custom Tab

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

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2014 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. -->
 
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Q: Why put style resources under values-v17/ ?
          A: Problem:
             1. paddingStart causes a crash on Galaxy Tab&Note b/8351339.
             2. So we wrote a build script(generate_v14_compatible_resources.py) to convert
                paddingStart to paddingLeft for pre-v17 (crbug.com/235118).
             3. However, style files are not overrided by the corresponding generated style files,
                but merged when we pass them to aapt unlike layout files.
 
             So we decided to keep style resources under values-v17/ so that it is not merged with
             the generated style resources under res_v14_compatibility/values/ (crbug.com/243952).
     -->
 
     <style name="MainTheme" parent="Theme.AppCompat.Light.NoActionBar">
         <item name="android:windowContentOverlay">@null</item>
         <item name="android:textColorHighlight">@color/text_highlight_color</item>
         <item name="android:statusBarColor" tools:targetApi="21">@android:color/black</item>
+        <item name="windowActionModeOverlay">true</item>

[Yusuf, 2015/07/23 05:23:34]

why do we need this one? Does it not change the behavior for the other
activities?

[Ian Wen, 2015/07/29 01:15:06]

Oh. This flag is to tell the CAB bar to overlay on chrome's content, instead of
squeezing the entire UI downwards. (Similar to use framelayout instead of
vertical linearlayout.)

In chromeTabbedActivity and DocumentActivity we already sets this flag
programatically. Yet it seems having an xml configuration is too wide and it
harms web apps. I moved this flag to the activity.

 
         <!--  Overriding AppCompat values -->
         <item name="colorControlNormal">@color/light_normal_color</item>
         <item name="colorControlActivated">@color/light_active_color</item>
 
         <!-- Default TintedImageButton tint -->
         <item name="tint">@color/dark_mode_tint</item>
 
         <!-- Navigation Transitions, requires API level 21 -->
         <item name="android:windowAllowEnterTransitionOverlap" tools:targetApi="21">false</item>
@@ skipping 361 matching lines @@
     <style name="LocationBarButton">
         <item name="android:background">@null</item>
     </style>
     <style name="ToolbarButton">
         <item name="android:background">?attr/selectableItemBackground</item>
         <item name="android:layout_width">48dp</item>
         <item name="android:layout_height">56dp</item>
         <item name="android:scaleType">center</item>
     </style>
 </resources>