[Android] Stop hiding the RWHV layer subtree when hiding the widget

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

 // 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.
 
 package org.chromium.chrome.browser;
 
 import android.app.Activity;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Color;
@@ skipping 1165 matching lines @@
 
         // When resuming the activity, force an update to the fullscreen state to ensure a
         // subactivity did not change the fullscreen configuration of this ChromeTab's renderer in
         // the case where it was shared (i.e. via an EmbedContentViewActivity).
         updateFullscreenEnabledState();
     }
 
     /**
      * Called on the foreground tab when the Activity is stopped.
      */
+    // TODO(jdduke): Remove after landing downstream dependency, crbug.com/434401.
     public void onActivityStop() {
-        hide();
     }
 
     /**
      * Prepares the tab to be shown. This method is supposed to be called before the tab is
      * displayed. It restores the ContentView if it is not available after the cold start and
      * reloads the tab if its renderer has crashed.
      * @param type Specifies how the tab was selected.
      */
     public final void show(TabSelectionType type) {
         try {
@@ skipping 1460 matching lines @@
     private native void nativeAttachToTabContentManager(long nativeTabAndroid,
             TabContentManager tabContentManager);
     private native void nativeAttachOverlayContentViewCore(long nativeTabAndroid,
             ContentViewCore content, boolean visible);
     private native void nativeDetachOverlayContentViewCore(long nativeTabAndroid,
             ContentViewCore content);
     private native boolean nativeHasPrerenderedUrl(long nativeTabAndroid, String url);
 
     private static native void nativeRecordStartupToCommitUma();
 }