Cleaning up PointerIdManager and add id re-mapping

third_party/WebKit/Source/core/events/PointerIdManager.cpp

-// 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.
-
-#include "config.h"
-#include "core/events/PointerIdManager.h"
-
-namespace blink {
-
-namespace {
-
-inline int toInt(WebPointerProperties::PointerType t) { return static_cast<int>(t); }
-
-} // namespace
-
-PointerIdManager::PointerIdManager()
-{
-    clear();
-}
-
-PointerIdManager::~PointerIdManager()
-{
-    clear();
-}
-
-void PointerIdManager::clear()
-{
-    for (int type = 0; type <= toInt(WebPointerProperties::PointerType::LastEntry); type++) {
-        m_ids[type].clear();
-        m_hasPrimaryId[type] = false;
-    }
-}
-
-void PointerIdManager::add(WebPointerProperties::PointerType type, unsigned id)
-{
-    if (m_ids[toInt(type)].isEmpty())
-        m_hasPrimaryId[toInt(type)] = true;
-    m_ids[toInt(type)].add(id);
-}
-
-void PointerIdManager::remove(WebPointerProperties::PointerType type, unsigned id)
-{
-    if (isPrimary(type, id)) {
-        m_ids[toInt(type)].removeFirst();
-        m_hasPrimaryId[toInt(type)] = false;
-    } else {
-        // Note that simply counting the number of ids instead of storing all of them is not enough.
-        // When id is absent, remove() should be a no-op.
-        m_ids[toInt(type)].remove(id);
-    }
-}
-
-bool PointerIdManager::isPrimary(WebPointerProperties::PointerType type, unsigned id)
-{
-    return m_hasPrimaryId[toInt(type)] && m_ids[toInt(type)].first() == id;
-}
-
-} // namespace blink