Enable running the `gulp xfatest* command on the bots

Depends on mozilla/pdf.js#13846

on_cmd_xfatest.js

@@ -0,0 +1,127 @@
+var botio = require(process.env['BOTIO_MODULE']);
+require('shelljs/global');
+
+var fail = false;
+
+exec('npm install', {async:true}, function() {
+exec('git submodule init', {async:false});
+exec('git submodule update', {async:false});
+
+silent(true);
+
+(function runTesting() {
+  //
+  // Get PDFs from local cache
+  //
+  echo();
+  echo('>> Deploying cached PDF files');
+  cp(__dirname+'/pdf-cache/*', './test/pdfs');
+
+  //
+  // Get ref snapshots
+  //
+  echo();
+  echo('>> Getting ref snapshots');
+  mkdir('-p', './test/ref');
+  cp('-Rf', __dirname+'/refs/*', './test/ref');
+
+  //
+  // Deploy custom files
+  //
+  echo();
+  echo('>> Deploying custom files');
+  cp('-f', __dirname+'/test-files/browser_manifest.json', './test/resources/browser_manifests');
+
+  //
+  // Run tests
+  //
+  echo();
+  echo('>> Running tests');
+
+  // Using {async} to avoid unnecessary CPU usage
+  exec('gulp botxfatest', {silent:false, async:true}, function(error, output) {
+    var integrationSuccessMatch = output.match(/All integration tests passed/g);
+    var unitSuccessMatch = output.match(/All unit tests passed/g);
+    var fontSuccessMatch = output.match(/All font tests passed/g);
+    var regSuccessMatch = output.match(/All regression tests passed/g);
+
+    if (fontSuccessMatch) {
+      botio.message('+ **Font tests:** Passed');
+    } else {
+      botio.message('+ **Font tests:** FAILED');
+      fail = true; // non-fatal, continue
+    }
+    if (unitSuccessMatch) {
+      botio.message('+ **Unit tests:** Passed');
+    } else {
+      botio.message('+ **Unit tests:** FAILED');
+      fail = true; // non-fatal, continue
+    }
+    if (integrationSuccessMatch) {
+      botio.message('+ **Integration Tests:** Passed');
+    } else {
+      botio.message('+ **Integration Tests:** FAILED');
+      fail = true; // non-fatal, continue
+    }
+    if (regSuccessMatch) {
+      botio.message('+ **Regression tests:** Passed');
+    } else {
+      botio.message('+ **Regression tests:** FAILED');
+      fail = true; // non-fatal, continue
+
+      // Include a detailed summary of the ref-test failures.
+      if (output.match(/OHNOES!  Some tests failed!/g)) {
+        const details = [];
+
+        const numErrors = output.match(/  errors: \d+/g);
+        if (numErrors) {
+          details.push(numErrors[0]);
+        }
+        const numEqFailures = output.match(/  different ref\/snapshot: \d+/g);
+        if (numEqFailures) {
+          details.push(numEqFailures[0]);
+        }
+        const numFBFFailures = output.match(/  different first\/second rendering: \d+/g);
+        if (numFBFFailures) {
+          details.push(numFBFFailures[0]);
+        }
+
+        if (details.length > 0) {
+          botio.message();
+          botio.message("```");
+          for (const line of details) {
+            botio.message(line);
+          }
+          botio.message("```");
+        }
+      }
+
+      //
+      // Copy reftest analyzer files
+      //
+      echo();
+      echo('>> Copying reftest analyzer files');
+      mv('-f', './test/eq.log', botio.public_dir);
+      mv('-f', './test/resources/reftest-analyzer.html', botio.public_dir);
+      mv('-f', './test/resources/reftest-analyzer.css', botio.public_dir);
+      mv('-f', './test/resources/reftest-analyzer.js', botio.public_dir);
+      mv('-f', './test/test_snapshots', botio.public_dir + '/');
+
+      botio.message();
+      botio.message('Image differences available at: '+botio.public_url+'/reftest-analyzer.html#web=eq.log');
+    }
+
+    //
+    // Update local cache of PDF files
+    //
+    echo();
+    echo('>> Updating local PDF cache')
+    mkdir('-p', __dirname+'/pdf-cache');
+    cp('./test/pdfs/*.pdf', __dirname+'/pdf-cache');
+
+    if (fail)
+      exit(1);
+  }); // exec test
+})(); // runTesting
+
+}); // npm install