The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/735a7a530ec5f5e291666ccc2fb406b76bcfe6c4

commit 735a7a530ec5f5e291666ccc2fb406b76bcfe6c4
Author: Miguel Casas <mcasas@chromium.org>
Date: Thu Jan 10 22:00:24 2019

canvas 2d: add lowLatency to CanvasRenderingContext2DSettings

Adds |lowLatency| to CanvasRenderingContext2DSettings and fills
it in from CanvasRenderingContext2D::getContextAttributes().
The few web_tests that touch this are updated.

Bug:  919592 
Change-Id: If535dfd480f2faae1ca0b4ba41f175ceb3c05ec8
Reviewed-on: https://chromium-review.googlesource.com/c/1405271
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#621766}
[modify] https://crrev.com/735a7a530ec5f5e291666ccc2fb406b76bcfe6c4/third_party/blink/renderer/modules/canvas/canvas2d/canvas_rendering_context_2d.cc
[modify] https://crrev.com/735a7a530ec5f5e291666ccc2fb406b76bcfe6c4/third_party/blink/renderer/modules/canvas/canvas2d/canvas_rendering_context_2d_settings.idl
[modify] https://crrev.com/735a7a530ec5f5e291666ccc2fb406b76bcfe6c4/third_party/blink/web_tests/fast/canvas-api/canvas-context-attributes-default-value.html
[modify] https://crrev.com/735a7a530ec5f5e291666ccc2fb406b76bcfe6c4/third_party/blink/web_tests/fast/canvas-api/canvas-lowlatency-getContext.html