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This relands commit d690c638.

Original change's description:
> [heap-profiler] Merge DOM node and its JS wrapper node in heap snapshot.
>
> Each DOM node has a corresponding JS wrapper node. In heap snapshot
> they appear as duplicates.
>
> Example retaining path with duplicates:
> - [1] in InternalNode @2041178784
> - [1] in HTMLDivElement @2041079168  // DOM node
> - [3] in HTMLDivElement @2231// JS wrapper
> - retainer in Window / @2105
>
> The heap snapshot generator now can merge an embedder node with a node
> returned by EmbedderGraph::Node::WrapperNode() function.
>
> This patch implements the WrapperNode() function for each DOM node.
>
> Bug: chromium:811925
> Change-Id: I9ea6bc7e45f8ab3d54828b9ac61f7230d04d8019
> Reviewed-on: https://chromium-review.googlesource.com/928503
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#539132}


Change-Id: I4223d1369874ad34dfff1a74d5725360c360300c
Reviewed-on: https://chromium-review.googlesource.com/951252
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541403}