📺 Move fullscreen web content to a new Activity.

chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java

 // Copyright 2015 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.
 
 package org.chromium.chrome.browser;
 
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.app.SearchManager;
@@ skipping 2135 matching lines @@
      * Called when VR mode is entered using this activity. 2D UI components that steal focus or
      * draw over VR contents should be hidden in this call.
      */
     public void onEnterVr() {}
 
     /**
      * Called when VR mode using this activity is exited. Any state set for VR should be restored
      * in this call, including showing 2D UI that was hidden.
      */
     public void onExitVr() {}
+
+    /**
+     * Whether this Activity supports moving a {@link Tab} to the
+     * {@link FullscreenWebContentsActivity} when it enters fullscreen.
+     */
+    public boolean supportsFullscreenActivity() {
+        return false;
+    }
 }