Reland "Use a single OffscreenCanvas for rendering in CanvasKit (#457… #59

	name: Third party deps scan
	on:
	# Only the default branch is supported.
	branch_protection_rule:
	push:
	branches: [ main ]
	pull_request:
	types: [ labeled ]

	# Declare default permissions as read only.
	permissions: read-all

	jobs:
	vuln-scan:
	name: Vulnerability scanning
	runs-on: ubuntu-20.04
	# run on flutter/engine push to main or PRs with 'vulnerability patch' label
	if: ${{ github.repository == 'flutter/engine' && (github.event_name == 'push' \|\| github.event.label.name == 'vulnerability scan') }}
	permissions:
	# Needed to upload the SARIF results to code-scanning dashboard.
	security-events: write
	actions: read
	contents: read
	# Needed to access OIDC token.
	id-token: write
	steps:
	- name: "Checkout code"
	uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
	with:
	persist-credentials: false
	- name: "setup python"
	uses: actions/setup-python@65d7f2d534ac1bc67fcd62888c5f4f3d2cb2b236
	with:
	python-version: '3.7.7' # install the python version needed
	- name: "extract and flatten deps"
	run: python ci/deps_parser.py
	- name: "scan deps for vulnerabilities"
	run: python ci/scan_flattened_deps.py
	# Upload the results as artifacts.
	- name: "Upload artifact"
	uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32
	with:
	name: SARIF file
	path: osvReport.sarif
	retention-days: 5
	# Upload the results to GitHub's code scanning dashboard.
	- name: "Upload to security tab"
	uses: github/codeql-action/upload-sarif@cdcdbb579706841c47f7063dda365e292e5cad7a
	with:
	sarif_file: osvReport.sarif

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