aura-x11: Add custom web cursor support.

ui/base/cursor/cursor.cc

+// Copyright (c) 2012 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.
+
+#include "ui/base/cursor/cursor.h"
+
+namespace ui {
+
+Cursor::Cursor()
+    : native_type_(0),
+      platform_cursor_(0) {
+}
+
+Cursor::Cursor(int type)
+    : native_type_(type),
+      platform_cursor_(0) {
+}
+
+Cursor::Cursor(const Cursor& cursor)
+    : native_type_(cursor.native_type_),
+      platform_cursor_(cursor.platform_cursor_) {
+  if (native_type_ == kCursorCustom)
+    RefCustomCursor();
+}
+
+Cursor::~Cursor() {
+  if (native_type_ == kCursorCustom)
+    UnrefCustomCursor();
+}
+
+void Cursor::SetPlatformCursor(const PlatformCursor& platform) {
+  if (platform_cursor_)
+    UnrefCustomCursor();
+  native_type_ = kCursorCustom;
+  platform_cursor_ = platform;
+  RefCustomCursor();
+}
+
+
+}  // namespace ui