Expose WindowAndroid from WebContents.

content/public/android/java/src/org/chromium/content_public/browser/WebContents.java

Index: content/public/android/java/src/org/chromium/content_public/browser/WebContents.java
diff --git a/content/public/android/java/src/org/chromium/content_public/browser/WebContents.java b/content/public/android/java/src/org/chromium/content_public/browser/WebContents.java
index 22d5e911de6f140d120ae69d2c02c1a4436bafd2..48e7450d52b41a346e4d4501954715933b850662 100644
--- a/content/public/android/java/src/org/chromium/content_public/browser/WebContents.java
+++ b/content/public/android/java/src/org/chromium/content_public/browser/WebContents.java
@@ -11,6 +11,7 @@ import android.os.Parcelable;
 
 import org.chromium.base.VisibleForTesting;
 import org.chromium.ui.OverscrollRefreshHandler;
+import org.chromium.ui.base.WindowAndroid;
 
 /**
  * The WebContents Java wrapper to allow communicating with the native WebContents object.
@@ -38,6 +39,11 @@ import org.chromium.ui.OverscrollRefreshHandler;
  */
 public interface WebContents extends Parcelable {
     /**
+     * @return The top level WindowAndroid associated with this WebContents.  This can be null.
+     */
+    WindowAndroid getTopLevelNativeWindow();
+
+    /**
      * Deletes the Web Contents object.
      */
     void destroy();