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This patch uses the new EmbedderGraph API to provide the heap snapshot
generator with all DOM nodes and references reachable from V8.

Bug: 749490
Change-Id: I26750a8b80dab4f88508e504b431d976a598c6c3
Reviewed-on: https://chromium-review.googlesource.com/890260
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533664}