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This is a reland of 2f2d5d96

This revised CL fixes the missing include of
third_party/blink/renderer/platform/scheduler/public/thread.h ,
originally missing.

TBR=haraken@chromium.org

Original change's description:
> Onion soup canvas_capture_handler.cc/h
>
> This is a first step to OnionSoup content/renderer/media_capture_from_element/.
>
> It summary, this CL
>
> - Moves content/renderer/media_capture_from_element/canvas_capture_handler* to
>   third_party/blink/renderer/modules/mediacapturefromelement/.
> - Adapts the existing code for Blink restrictions, eg use WTF::Bind
>   instead of base::Bind.
> - Removes the code that used to plumb the creation of
>   content::CanvasCaptureHandler instances through blink::Platform, and make
>   blink::HTMLCanvasElementCapture to create it (see the second TODO
>   below).
>
> To be done (follow up CLs):
>
> - migrate some remaining base::Bind{Once,Repeating} uses to the
>   respective Blink/WTF alternatives. This is now blocked on having
>   a CrossThreadBindOnce implementation available (see
>   crrev.com/c/1597228).
> - eliminate blink::WebCanvasCaptureHandler
>   third_party/blink/public/platform/web_canvas_capture_handler.h.
>   Note that this is not done now because there is code in
>   third_party/blink/renderer/core/html/canvas/canvas_draw_listener.cc|h
>   that use blink::WebCanvasCaptureHandler, and can not use
>   blink::CanvasCaptureHandler directly, because core/ can not depend on
>   modules/.
>
> R=kentaro@chromium.org, guidou@chromium.org
>
> BUG=787261
>
> Change-Id: Id2dc1f6441e2568c8420f0849a2cb5f87f9a6d75
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1600898
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Guido Urdaneta <guidou@chromium.org>
> Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
> Cr-Commit-Position: refs/heads/master@{#658376}

Bug: 787261
Change-Id: I9b5829d82c1b5420a5fc8c4cbb33505284471912
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1605560
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#658521}