Change cc::ElementId to be a uint64_t

cc/trees/layer_tree_host.cc

 // Copyright 2011 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 "cc/trees/layer_tree_host.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1214 matching lines @@
                                       ElementListType list_type,
                                       Layer* layer) {
   mutator_host_->UnregisterElement(element_id, list_type);
 
   if (layer->element_id()) {
     element_layers_map_.erase(layer->element_id());
   }
 }
 
 static void SetElementIdForTesting(Layer* layer) {
-  layer->SetElementId(LayerIdToElementIdForTesting(layer->id()));
+  layer->SetElementId(layer->id());
 }
 
 void LayerTreeHost::SetElementIdsForTesting() {
   LayerTreeHostCommon::CallFunctionForEveryLayer(this, SetElementIdForTesting);
 }
 
 void LayerTreeHost::BuildPropertyTreesForTesting() {
   gfx::Transform identity_transform;
   PropertyTreeBuilder::BuildPropertyTrees(
       root_layer(), page_scale_layer(), inner_viewport_scroll_layer(),
@@ skipping 193 matching lines @@
 void LayerTreeHost::SetNeedsDisplayOnAllLayers() {
   for (auto* layer : *this)
     layer->SetNeedsDisplay();
 }
 
 void LayerTreeHost::SetHasCopyRequest(bool has_copy_request) {
   has_copy_request_ = has_copy_request;
 }
 
 }  // namespace cc