Change cc::ElementId to be a uint64_t

third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.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 "platform/graphics/compositing/PaintArtifactCompositor.h"
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/picture_layer.h"
 #include "cc/paint/display_item_list.h"
@@ skipping 649 matching lines @@
         pending_layer.property_tree_state.Clip());
     int effect_id = property_tree_manager.SwitchToEffectNode(
         *pending_layer.property_tree_state.Effect());
 
     layer->set_offset_to_transform_parent(layer_offset);
     CompositorElementId element_id =
         pending_layer.property_tree_state.GetCompositorElementId(
             composited_element_ids);
     if (element_id) {
       layer->SetElementId(element_id);
-      composited_element_ids.insert(element_id);
+      composited_element_ids.insert(element_id.id);
     }
 
     root_layer_->AddChild(layer);
     layer->set_property_tree_sequence_number(g_s_property_tree_sequence_number);
     layer->SetTransformTreeIndex(transform_id);
     layer->SetClipTreeIndex(clip_id);
     layer->SetEffectTreeIndex(effect_id);
     property_tree_manager.UpdateLayerScrollMapping(layer.get(), transform);
 
     layer->SetShouldCheckBackfaceVisibility(pending_layer.backface_hidden);
@@ skipping 16 matching lines @@
 #ifndef NDEBUG
 void PaintArtifactCompositor::ShowDebugData() {
   LOG(ERROR) << LayersAsJSON(kLayerTreeIncludesDebugInfo)
                     ->ToPrettyJSONString()
                     .Utf8()
                     .data();
 }
 #endif
 
 }  // namespace blink