webrtc wpt: pass test in promise_test and async_test

passes the test argument in promise_test and async_test
so it can be used to add cleanup.
Change done with a jscodeshift codemod that detects
there were no arguments to promise_test (or async_test):

export default function transformer(file, api) {
  const j = api.jscodeshift;
  return j(file.source)
    // .find(j.CallExpression)
    .find(j.CallExpression, {callee: {type: 'Identifier', name: 'promise_test'}})
    .forEach(path => {
        if (path.value.arguments[0].params.length === 0) {
          path.value.arguments[0].params.push(j.identifier('t'));
        }
    })
    .toSource();
};

BUG=836871

Change-Id: Ie7dd7fb0dd8a4da6c4c00f3616fd41d1d47854ef
Reviewed-on: https://chromium-review.googlesource.com/1047674Reviewed-by: Harald Alvestrand <hta@chromium.org>
Commit-Queue: Harald Alvestrand <hta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556711}

third_party/WebKit/LayoutTests/external/wpt/webrtc/RTCPeerConnection-getIdentityAssertion.html

@@ -36,7 +36,7 @@
         DOMString peerIdentity;
       };
    */
-  promise_test(() => {
+  promise_test(t => {
     const pc = new RTCPeerConnection();
     const port = window.location.port;
 
@@ -95,7 +95,7 @@
 
   // When generating assertion, the RTCPeerConnection doesn't care if the returned assertion
   // represents identity of different domain
-  promise_test(() => {
+  promise_test(t => {
     const pc = new RTCPeerConnection();
     const port = window.location.port;
 
@@ -278,7 +278,7 @@
         value is provided for the peerIdentity member of RTCConfiguration, the value from
         RTCConfiguration is used.
   */
-  promise_test(() => {
+  promise_test(t => {
     const pc = new RTCPeerConnection({
       peerIdentity: 'bob@example.net'
     });
@@ -302,7 +302,7 @@
     9.6.  setIdentityProvider
       3.  If any identity provider value has changed, discard any stored identity assertion.
    */
-  promise_test(() => {
+  promise_test(t => {
     const pc = new RTCPeerConnection();
     const port = window.location.port;
     const [idpDomain] = getIdpDomains();

third_party/WebKit/LayoutTests/external/wpt/webrtc/RTCRtpReceiver-getContributingSources.https.html

@@ -38,7 +38,7 @@
         possibly encode, and 127 represents silence.
    */
 
-  promise_test(() => {
+  promise_test(t => {
     const pc1 = new RTCPeerConnection();
     const pc2 = new RTCPeerConnection();
 

third_party/WebKit/LayoutTests/external/wpt/webrtc/RTCRtpReceiver-getStats.https.html

@@ -44,7 +44,7 @@
           added.
    */
 
-  promise_test(async () => {
+  promise_test(async t => {
     const caller = new RTCPeerConnection();
     const callee = new RTCPeerConnection();
     const { receiver } = caller.addTransceiver('audio');
@@ -55,7 +55,7 @@
     assert_stats_report_has_stats(statsReport, ['inbound-rtp']);
   }, 'receiver.getStats() via addTransceiver should return stats report containing inbound-rtp stats');
 
-  promise_test(async () => {
+  promise_test(async t => {
     const caller = new RTCPeerConnection();
     const callee = new RTCPeerConnection();
     const stream = await navigator.mediaDevices.getUserMedia({audio:true});