Change cc::ElementId to be a uint64_t

cc/trees/scroll_node.cc

 // Copyright 2016 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 "base/trace_event/trace_event_argument.h"
 #include "cc/base/math_util.h"
 #include "cc/input/main_thread_scrolling_reason.h"
 #include "cc/layers/layer.h"
 #include "cc/trees/element_id.h"
 #include "cc/trees/property_tree.h"
 #include "cc/trees/scroll_node.h"
 
 namespace cc {
 
 ScrollNode::ScrollNode()
     : id(ScrollTree::kInvalidNodeId),
       parent_id(ScrollTree::kInvalidNodeId),
       owning_layer_id(Layer::INVALID_ID),
       scrollable(false),
       main_thread_scrolling_reasons(
           MainThreadScrollingReason::kNotScrollingOnMain),
       max_scroll_offset_affected_by_page_scale(false),
       scrolls_inner_viewport(false),
       scrolls_outer_viewport(false),
       should_flatten(false),
       user_scrollable_horizontal(false),
       user_scrollable_vertical(false),
+      element_id(kInvalidElementId),
       transform_id(0) {}
 
 ScrollNode::ScrollNode(const ScrollNode& other) = default;
 
 bool ScrollNode::operator==(const ScrollNode& other) const {
   return id == other.id && parent_id == other.parent_id &&
          owning_layer_id == other.owning_layer_id &&
          scrollable == other.scrollable &&
          main_thread_scrolling_reasons == other.main_thread_scrolling_reasons &&
          non_fast_scrollable_region == other.non_fast_scrollable_region &&
@@ skipping 17 matching lines @@
   value->SetBoolean("scrollable", scrollable);
   MathUtil::AddToTracedValue("scroll_clip_layer_bounds",
                              scroll_clip_layer_bounds, value);
   MathUtil::AddToTracedValue("bounds", bounds, value);
   MathUtil::AddToTracedValue("offset_to_transform_parent",
                              offset_to_transform_parent, value);
   value->SetBoolean("should_flatten", should_flatten);
   value->SetBoolean("user_scrollable_horizontal", user_scrollable_horizontal);
   value->SetBoolean("user_scrollable_vertical", user_scrollable_vertical);
 
-  element_id.AddToTracedValue(value);
+  value->SetInteger("element_id", element_id);
   value->SetInteger("transform_id", transform_id);
 }
 
 }  // namespace cc