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This adds the needed changes to use dynamic viewports for the ARCore
WebXR device, and opts in to using that.

It also changes the texture MAG filter used when enlarging a texture to
use LINEAR interpolation. This should also be beneficial when using a
custom framebufferScaleFactor independent of dynamic viewport scaling
to avoid pixelation artifacts.

Bug: 1133381
Change-Id: I442124de1090f971edbc822dd3ba8550301c2e7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436683
Commit-Queue: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Piotr Bialecki <bialpio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813092}