Support setting mouse cursor icon in Android N.

chrome/android/java/src/org/chromium/chrome/browser/widget/OverviewListLayout.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.widget;
 
 import android.content.Context;
 import android.view.LayoutInflater;
+import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
 import android.widget.ListView;
 
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.compositor.layouts.Layout;
 import org.chromium.chrome.browser.compositor.layouts.LayoutRenderHost;
 import org.chromium.chrome.browser.compositor.layouts.LayoutUpdateHost;
 import org.chromium.chrome.browser.compositor.layouts.content.TabContentManager;
@@ skipping 31 matching lines @@
             mTabModelWrapper =
                     (AccessibilityTabModelWrapper) LayoutInflater.from(container.getContext())
                             .inflate(R.layout.accessibility_tab_switcher, null);
             mTabModelWrapper.setup(this);
             mTabModelWrapper.setTabModelSelector(mTabModelSelector);
             adjustForFullscreen();
         }
 
         if (container == null || mTabModelWrapper.getParent() != null) return;
 
-        ((ViewGroup) container.findViewById(R.id.overview_list_layout_holder))
-                .addView(mTabModelWrapper);
+        ViewGroup overviewList =
+                (ViewGroup) container.findViewById(R.id.overview_list_layout_holder);
+        overviewList.setVisibility(View.VISIBLE);
+        overviewList.addView(mTabModelWrapper);
     }
 
     @Override
     public ViewportMode getViewportMode() {
         return ViewportMode.ALWAYS_FULLSCREEN;
     }
 
     @Override
     protected void notifySizeChanged(float width, float height, int orientation) {
         adjustForFullscreen();
@@ skipping 73 matching lines @@
         super.startHiding(nextId, hintAtTabSelection);
 
         doneHiding();
     }
 
     @Override
     public void detachViews() {
         if (mTabModelSelector != null) mTabModelSelector.commitAllTabClosures();
         if (mTabModelWrapper != null) {
             ViewGroup parent = (ViewGroup) mTabModelWrapper.getParent();
-            if (parent != null) parent.removeView(mTabModelWrapper);
+            if (parent != null) {
+                parent.setVisibility(View.GONE);
+                parent.removeView(mTabModelWrapper);
+            }
         }
     }
 
     @Override
     public void setTabModelSelector(
             TabModelSelector tabModelSelector, TabContentManager tabContentManager) {
         super.setTabModelSelector(tabModelSelector, tabContentManager);
 
         if (mTabModelWrapper == null) return;
         mTabModelWrapper.setTabModelSelector(tabModelSelector);
@@ skipping 31 matching lines @@
     @Override
     protected EventFilter getEventFilter() {
         return mBlackHoleEventFilter;
     }
 
     @Override
     protected SceneLayer getSceneLayer() {
         return mSceneLayer;
     }
 }