Add an experimental search widget

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

Index: chrome/android/java/res/values-v17/styles.xml
diff --git a/chrome/android/java/res/values-v17/styles.xml b/chrome/android/java/res/values-v17/styles.xml
index 9e598e4a4c424b5bb7aaba0129dc9f2be9f7d115..9df8a1545d6d8700f0cfc3b6daabdaf7518210b6 100644
--- a/chrome/android/java/res/values-v17/styles.xml
+++ b/chrome/android/java/res/values-v17/styles.xml
@@ -73,6 +73,16 @@
         <item name="android:maxLines">2</item>
     </style>
 
+    <style name="OverlayTheme" parent="MainTheme">
+      <!-- Using these values will make the Activity translucent.
+           <item name="android:windowIsTranslucent">true</item>
+           <item name="android:windowBackground">@android:color/transparent</item>
+           <item name="android:windowContentOverlay">@null</item>
+           <item name="android:windowNoTitle">true</item>
+      -->
+      <item name="android:windowBackground">@color/light_normal_color</item>
+    </style>
+
     <style name="AlertDialogTheme" parent="Theme.AppCompat.Light.Dialog.Alert">
         <item name="android:textColorHighlight">@color/text_highlight_color</item>