Add tab reparenting

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index 19c37376a716ea9d7fff9451d2c04dcf1a11cb07..9c2105f3bd45379ce2bc120de6f6bc7a2b4b6be5 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -786,6 +786,16 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
         mWebContentsObserver = new ContentViewWebContentsObserver(this);
     }
 
+    /**
+     * Updates the native {@link ContentViewCore} with a new window. This moves the NativeView and
+     * attached it to the new NativeWindow linked with the given {@link WindowAndroid}.
+     * @param windowAndroid The new {@link WindowAndroid} for this {@link ContentViewCore}.
+     */
+    public void updateWindowAndroid(WindowAndroid windowAndroid) {
+        long windowNativePointer = windowAndroid == null ? 0 : windowAndroid.getNativePointer();
+        nativeUpdateWindowAndroid(mNativeContentViewCore, windowNativePointer);
+    }
+
     @VisibleForTesting
     public void createContentViewAndroidDelegate() {
         mViewAndroidDelegate = new ContentViewAndroidDelegate(mContainerView, mRenderCoordinates);
@@ -3210,6 +3220,8 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
             long windowAndroidPtr, HashSet<Object> retainedObjectSet);
     private static native ContentViewCore nativeFromWebContentsAndroid(WebContents webContents);
 
+    private native void nativeUpdateWindowAndroid(
+            long nativeContentViewCoreImpl, long windowAndroidPtr);
     private native WebContents nativeGetWebContentsAndroid(long nativeContentViewCoreImpl);
     private native WindowAndroid nativeGetJavaWindowAndroid(long nativeContentViewCoreImpl);