[Copyright] Fix copyright headers in Chromium.

This CL updates copyright headers in /gpu
to the current format:

// Copyright $year The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

Generated with:

./tools/git/mffr.py -g "*.cc" -g "*.h" -g "*.mm" -g "*.py" -g "*.js" -g "*.java" -g "*.mojom" -g "*.xml" -g "*.jinja" -g "*.gn" -g "*.gni" -g "*.star" -g "*.icon" -g "*.ts" -g "*.css" -g "*.json" -g "*.html" -g "*.proto" -g "*.idl" -g "*.pins" -g "*.yml" -g "*.sh" 'Chromium Authors\. All rights reserved\.' 'Chromium Authors'

Additional manual fixes were made to files that have extra "(C)"
strings, or where line breaks were wrong.

This CL was uploaded by git cl split.

R=zmo@chromium.org

Bug: 1457007
Change-Id: Iaeda21bc439dc8ab673c3324977231313a242ef3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4824315
Auto-Submit: Mark Foltz <mfoltz@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1189850}