Implement ./mach bootstrap for MacOS

[mrobinson]

---

• ./mach build -d does not report any errors
• ./mach test-tidy does not report any errors
• These changes do not require tests because they just change build scripts.

[mukilan]

@bors-servo r+

[bors-servo]

📌 Commit a57c49a has been approved by mukilan

[bors-servo]

⌛ Testing commit a57c49a with merge a98dcff...

[github-actions]

Test results for linux-wpt-layout-2020 from try job (#5344013871):

Flaky unexpected result (1)

• FAIL [expected PASS] /_mozilla/css/iframe/hide_and_show.html (#15265)

[github-actions]

Test results for linux-wpt-layout-2013 from try job (#5344013871):

Flaky unexpected result (19)

• TIMEOUT [expected OK] /_webgl/conformance/glsl/misc/shader-uniform-packing-restrictions.html (#28103)
  • NOTRUN [expected PASS] subtest: Overall test
• TIMEOUT [expected OK] /_webgl/conformance/glsl/misc/shader-with-non-reserved-words.html (#16216)
  • NOTRUN [expected PASS] subtest: Overall test
• TIMEOUT [expected OK] /_webgl/conformance/uniforms/out-of-bounds-uniform-array-access.html (#26225)
  • NOTRUN [expected PASS] subtest: Overall test
• TIMEOUT [expected OK] /html/browsers/browsing-the-web/history-traversal/srcdoc/consecutive-srcdoc.html (#29084)
  • TIMEOUT [expected FAIL] subtest: changing srcdoc does a replace navigation since the URL is still about:srcdoc Test timed out
  • NOTRUN [expected FAIL] subtest: changing srcdoc to about:srcdoc#yo then another srcdoc does two push navigations and we can navigate back
• TIMEOUT [expected OK] /html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-src-aboutblank-navigate-immediately.html (#29048)
  • TIMEOUT [expected FAIL] subtest: Navigating to a different document with link click Test timed out
  • NOTRUN [expected FAIL] subtest: Navigating to a different document with form submission
• OK /html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html (#28681)
  • FAIL [expected PASS] subtest: load & pageshow events do not fire on contentWindow of <iframe> element created with src='' assert_unreached: load should not be fired Reached unreachable code
  • FAIL [expected PASS] subtest: load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank' assert_unreached: load should not be fired Reached unreachable code
• OK /html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html (#28697)
  • PASS [expected FAIL] subtest: aElement.click() before the load event must NOT replace
• TIMEOUT [expected OK] /html/browsers/browsing-the-web/overlapping-navigations-and-traversals/nav-cancelation-2.sub.html (#29738)
  • TIMEOUT [expected FAIL] subtest: grandparent cancels a pending navigation in a cross-origin grandchild Test timed out
• TIMEOUT [expected OK] /html/browsers/origin/cross-origin-objects/cross-origin-objects.html (#28569)
• OK /html/browsers/the-window-object/open-close/creating_browsing_context_test_01.html (#29046)
  • PASS [expected FAIL] subtest: first argument: absolute url
• TIMEOUT [expected OK] /html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html (#22154)
  • NOTRUN [expected FAIL] subtest: Check that popups from a sandboxed iframe do not escape the sandbox
• OK /html/semantics/embedded-content/the-img-element/non-active-document.html (#21544)
  • FAIL [expected PASS] subtest: createHTMLDocument assert_unreached: got unexpected error event Reached unreachable code
  • FAIL [expected PASS] subtest: <template> assert_unreached: got unexpected error event Reached unreachable code
• OK /html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html (#23205)
  • PASS [expected FAIL] subtest: Check that rel=noopener with target=_self does a normal load
• TIMEOUT /html/webappapis/scripting/events/compile-event-handler-settings-objects.html (#24246)
  • FAIL [expected PASS] subtest: The entry settings object while executing the compiled callback via Web IDL's invoke must be that of the node document assert_equals: expected "/html/webappapis/scripting/events/resources/open-window.html" but got "blank"
• ERROR /resource-timing/content-type-parsing.html (#29131)
  • FAIL [expected TIMEOUT] subtest: mime-type 16 : text/html;charset=�gbk assert_equals: expected (string) "text/html" but got (undefined) undefined
  • TIMEOUT [expected NOTRUN] subtest: mime-type 17 : text/html;charset=gbk Test timed out
• TIMEOUT /resource-timing/response-status-code.html (#29309)
  • TIMEOUT [expected FAIL] subtest: This test validates the response status of resources. 88 Test timed out
  • NOTRUN [expected TIMEOUT] subtest: This test validates the response status of resources. 89
• OK /resource-timing/status-codes-create-entry.html (#28675)
  • PASS [expected FAIL] subtest: Make sure all status codes are reported
• TIMEOUT [expected OK] /webaudio/the-audio-api/the-audiocontext-interface/audiocontext-not-fully-active.html (#27664)
• ERROR [expected TIMEOUT] /webaudio/the-audio-api/the-audiocontext-interface/audiocontext-suspend-resume.html (#25731)
  • FAIL [expected PASS] subtest: X After close, offlineContext.state is not equal to closed. Got running. assert_true: expected true got false

Stable unexpected results that are known to be intermittent (13)

• OK [expected TIMEOUT] /_mozilla/mozilla/img_placeholder_load.html (#28717)
  • PASS [expected TIMEOUT] subtest: Loading a placeholder image should trigger an error on the img element
• OK /html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.html (#29049)
  • FAIL [expected PASS] subtest: Same-origin navigation started from unload handler must be ignored assert_equals: expected "?pass" but got "?fail"
• TIMEOUT [expected OK] /html/browsers/windows/embedded-opener-remove-frame.html (#23867)
  • TIMEOUT [expected FAIL] subtest: opener of discarded auxiliary browsing context Test timed out
• OK [expected TIMEOUT] /html/interaction/focus/the-autofocus-attribute/supported-elements.html (#24145)
  • FAIL [expected TIMEOUT] subtest: Element with tabindex should support autofocus assert_equals: expected "SPAN" but got "BODY"
  • PASS [expected NOTRUN] subtest: Non-HTMLElement should not support autofocus
  • FAIL [expected NOTRUN] subtest: Host element with delegatesFocus should support autofocus promise_test: Unhandled rejection with value: object "TypeError: host.attachShadow is not a function"
  • FAIL [expected NOTRUN] subtest: Host element with delegatesFocus including no focusable descendants should be skipped promise_test: Unhandled rejection with value: object "TypeError: host.attachShadow is not a function"
  • FAIL [expected NOTRUN] subtest: Area element should support autofocus assert_equals: expected Element node <area></area> but got Element node <body>
    <img src="/media/poster.png" usemap="#map">
    <map n...
• OK [expected TIMEOUT] /html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html (#22667)
  • FAIL [expected TIMEOUT] subtest: Check that popups from a sandboxed iframe escape the sandbox if
    allow-popups-to-escape-sandbox is used assert_equals: It came from a sandboxed iframe expected "null" but got "http://web-platform.test:8000"
• TIMEOUT [expected CRASH] /html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html (#24066)
  • NOTRUN [expected FAIL] subtest: Check that popups from a sandboxed iframe do not escape the sandbox
• OK /html/semantics/forms/form-submission-0/multipart-formdata.window.html (#28725)
  • FAIL [expected PASS] subtest: multipart/form-data: \r\n in value (formdata event) assert_equals: expected "\r\nContent-Disposition: form-data; name="a"\r\n\r\nb\r\nc\r\n--\r\n" but got ""
• OK /html/semantics/forms/historical.html (#28568)
  • FAIL [expected PASS] subtest: <input name=isindex> should not be supported assert_regexp_match: expected object "/?isindex=x$/" but got "about:blank"
• OK [expected TIMEOUT] /html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html (#25805)
  • FAIL [expected TIMEOUT] subtest: Fulfillment handler on pending-then-fulfilled promise assert_equals: expected "http://web-platform.test:8000/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/resources/window-to-open.html" but got "http://web-platform.test:8000/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/resources/relevant/resources/window-to-open.html"
  • FAIL [expected TIMEOUT] subtest: Rejection handler on pending-then-rejected promise assert_equals: expected "http://web-platform.test:8000/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/resources/window-to-open.html" but got "http://web-platform.test:8000/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/resources/relevant/resources/window-to-open.html"
• TIMEOUT [expected CRASH] /webmessaging/broadcastchannel/cross-partition.https.tentative.html (#29058)
• OK [expected TIMEOUT] /webmessaging/with-ports/017.html (#24486)
  • PASS [expected TIMEOUT] subtest: origin of the script that invoked the method, about:blank
• TIMEOUT [expected OK] /webmessaging/with-ports/018.html (#24485)
  • TIMEOUT [expected PASS] subtest: origin of the script that invoked the method, javascript: Test timed out
• OK [expected TIMEOUT] /webmessaging/without-ports/017.html (#24486)
  • PASS [expected TIMEOUT] subtest: origin of the script that invoked the method, about:blank

[bors-servo]

☀️ Test successful - checks-github
Approved by: mukilan
Pushing a98dcff to master...