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This is a reland of 1cc19640.

Original change's description:
> [gin] Implement v8::Platform::GetPageAllocator.
> 
> - Implements a v8::PageAllocator in terms of base page allocator functions.
>   This will cause V8 to use Chromium's page allocator and address space
>   randomization.
> 
> Bug: chromium:756050
> Change-Id: Id076e599e7d5f09eddc78888245fc6bf879b1236
> Reviewed-on: https://chromium-review.googlesource.com/896959
> Reviewed-by: Jeremy Roman <jbroman@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Commit-Queue: Bill Budge <bbudge@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#533782}

Bug: chromium:756050
Change-Id: I950f3c2b4d488a558fe10893525b1c0f02bc69af
Reviewed-on: https://chromium-review.googlesource.com/898435Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533906}