Support setting mouse cursor icon in Android N.

chrome/android/java/src/org/chromium/chrome/browser/coordinator/CoordinatorLayoutForPointer.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.chrome.browser.coordinator;
+
+import android.content.Context;
+import android.os.Build;
+import android.support.design.widget.CoordinatorLayout;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.PointerIcon;
+import android.view.View;
+
+/**
+ * This class overrides {@link onResolvePointerIcon} method to correctly determine the pointer icon
+ * from a mouse motion event. This is needed because the default android impl does not consider
+ * view visibility.
+ */
+public class CoordinatorLayoutForPointer extends CoordinatorLayout {
+    public CoordinatorLayoutForPointer(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    private boolean isWithinBoundOfView(int x, int y, View view) {
+        return ((x >= view.getLeft() && x <= view.getRight())
+                && (y >= view.getTop() && y <= view.getBottom()));
+    }
+
+    @Override
+    public PointerIcon onResolvePointerIcon(MotionEvent event, int pointerIndex) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) return null;
+
+        final int x = (int) event.getX(pointerIndex);
+        final int y = (int) event.getY(pointerIndex);
+        final int childrenCount = getChildCount();
+        for (int i = childrenCount - 1; i >= 0; --i) {
+            if (getChildAt(i).getVisibility() != VISIBLE) continue;
+            if (isWithinBoundOfView(x, y, getChildAt(i))) {
+                return getChildAt(i).onResolvePointerIcon(event, pointerIndex);
+            }
+        }
+        return super.onResolvePointerIcon(event, pointerIndex);
+    }
+}