Change cc::ElementId to be a uint64_t

third_party/WebKit/Source/core/dom/DOMNodeIds.cpp

 // Copyright 2014 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 "core/dom/DOMNodeIds.h"
 
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
-DEFINE_WEAK_IDENTIFIER_MAP(Node);
+DEFINE_WEAK_IDENTIFIER_MAP(Node, unsigned long long);
 
 // static
-int DOMNodeIds::IdForNode(Node* node) {
-  return WeakIdentifierMap<Node>::Identifier(node);
+unsigned long long DOMNodeIds::IdForNode(Node* node) {
+  unsigned long long retval =
+      WeakIdentifierMap<Node, unsigned long long>::Identifier(node);
+  DCHECK_GT(retval, 0ull);
+  return retval;
 }
 
 // static
-Node* DOMNodeIds::NodeForId(int id) {
-  return WeakIdentifierMap<Node>::Lookup(id);
+Node* DOMNodeIds::NodeForId(unsigned long long id) {
+  return WeakIdentifierMap<Node, unsigned long long>::Lookup(id);
 }
 
 }  // namespace blink