Support setting mouse cursor icon in Android N.

content/shell/android/java/src/org/chromium/content_shell/ShellViewAndroidDelegate.java

 // Copyright 2017 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.content_shell;
 
+import android.graphics.Bitmap;
 import android.view.ViewGroup;
 
+import org.chromium.base.test.util.CallbackHelper;
+import org.chromium.blink_public.web.WebCursorInfoType;
 import org.chromium.ui.base.ViewAndroidDelegate;
 
 /**
  * Implementation of the abstract class {@link ViewAndroidDelegate} for content shell.
  * Extended for testing.
  */
 public class ShellViewAndroidDelegate extends ViewAndroidDelegate {
+    /**
+     * CallbackHelper for cursor update.
+     */
+    public static class OnCursorUpdateHelper extends CallbackHelper {
+        private int mPointerType;
+        public void notifyCalled(int type) {
+            mPointerType = type;
+            notifyCalled();
+        }
+        public int getPointerType() {
+            assert getCallCount() > 0;
+            return mPointerType;
+        }
+    }
+
     private final ViewGroup mContainerView;
+    private final OnCursorUpdateHelper mOnCursorUpdateHelper;
 
     public ShellViewAndroidDelegate(ViewGroup containerView) {
         mContainerView = containerView;
+        mOnCursorUpdateHelper = new OnCursorUpdateHelper();
     }
 
     @Override
     public ViewGroup getContainerView() {
         return mContainerView;
     }
+
+    public OnCursorUpdateHelper getOnCursorUpdateHelper() {
+        return mOnCursorUpdateHelper;
+    }
+
+    @Override
+    public void onCursorChangedToCustom(Bitmap customCursorBitmap, int hotspotX, int hotspotY) {
+        super.onCursorChangedToCustom(customCursorBitmap, hotspotX, hotspotY);
+        mOnCursorUpdateHelper.notifyCalled(WebCursorInfoType.TYPE_CUSTOM);
+    }
+
+    @Override
+    public void onCursorChanged(int cursorType) {
+        super.onCursorChanged(cursorType);
+        mOnCursorUpdateHelper.notifyCalled(cursorType);
+    }
 }