Refactor and push window properties up to class properties.

ui/base/class_property.cc

+// 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.
+
+#include "ui/base/class_property.h"
+
+#include <algorithm>
+#include <utility>
+
+namespace ui {
+
+PropertyHandler::PropertyHandler() {}
+
+PropertyHandler::~PropertyHandler() {
+  ClearProperties();
+}
+
+int64_t PropertyHandler::SetPropertyInternal(const void* key,
+                                             const char* name,
+                                             PropertyDeallocator deallocator,
+                                             int64_t value,
+                                             int64_t default_value) {
+  // This code may be called before |port_| has been created.
+  std::unique_ptr<PropertyData> data = BeforePropertyChange(key);
+  int64_t old = GetPropertyInternal(key, default_value);
+  if (value == default_value) {
+    prop_map_.erase(key);
+  } else {
+    Value prop_value;
+    prop_value.name = name;
+    prop_value.value = value;
+    prop_value.deallocator = deallocator;
+    prop_map_[key] = prop_value;
+  }
+  AfterPropertyChange(key, old, std::move(data));
+  return old;
+}
+
+std::unique_ptr<PropertyData> PropertyHandler::BeforePropertyChange(
+    const void* key) {
+  return nullptr;
+}
+
+void PropertyHandler::ClearProperties() {
+  // Clear properties.
+  for (std::map<const void*, Value>::const_iterator iter = prop_map_.begin();
+       iter != prop_map_.end();
+       ++iter) {
+    if (iter->second.deallocator)
+      (*iter->second.deallocator)(iter->second.value);
+  }
+  prop_map_.clear();
+}
+
+int64_t PropertyHandler::GetPropertyInternal(const void* key,
+                                             int64_t default_value) const {
+  std::map<const void*, Value>::const_iterator iter = prop_map_.find(key);
+  if (iter == prop_map_.end())
+    return default_value;
+  return iter->second.value;
+}
+
+std::set<const void*> PropertyHandler::GetAllPropertyKeys() const {
+  std::set<const void*> keys;
+  for (auto& pair : prop_map_)
+    keys.insert(pair.first);
+  return keys;
+}
+
+} // namespace ui