Support setting mouse cursor icon in Android N.

chrome/android/java/src/org/chromium/chrome/browser/widget/OverviewListLayout.java

Index: chrome/android/java/src/org/chromium/chrome/browser/widget/OverviewListLayout.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/widget/OverviewListLayout.java b/chrome/android/java/src/org/chromium/chrome/browser/widget/OverviewListLayout.java
index 7a9177e75bd49a856249cef8716576e00c849cba..1ea62a1b7a1d2b3cbaa878b4d44233c42947b20a 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/widget/OverviewListLayout.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/widget/OverviewListLayout.java
@@ -6,6 +6,7 @@ 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;
@@ -57,8 +58,10 @@ public class OverviewListLayout extends Layout implements AccessibilityTabModelA
 
         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
@@ -152,7 +155,10 @@ public class OverviewListLayout extends Layout implements AccessibilityTabModelA
         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);
+            }
         }
     }