Save travis job id

Author: tinayuangao

tools/gulp/tasks/screenshots.ts

@@ -20,8 +20,7 @@ task('screenshots', () => {
       .then(() => setScreenFilenames(database, prNumber))
       .then(() => uploadScreenshots(prNumber, 'diff'))
       .then(() => uploadScreenshots(prNumber, 'test'))
-      .then(() => updateTravisCommit(database, prNumber))
-      .then(() => updatePRSha(database, prNumber))
+      .then(() => updateTravis(database, prNumber))
       .then(() => database.goOffline(), () => database.goOffline());
   }
 });
@@ -36,16 +35,13 @@ function updateResult(database: admin.database.Database, prNumber: string,
   return database.ref(FIREBASE_REPORT).child(`${prNumber}/result`).set(result);
 }
 
-function updateTravisCommit(database: admin.database.Database,
+function updateTravis(database: admin.database.Database,
                       prNumber: string): admin.Promise<void> {
-  return database.ref(FIREBASE_REPORT).child(`${prNumber}/commit`)
-    .set(process.env['TRAVIS_COMMIT']);
-}
-
-function updatePRSha(database: admin.database.Database,
-                      prNumber: string): admin.Promise<void> {
-  return database.ref(FIREBASE_REPORT).child(`${prNumber}/sha`)
-    .set(process.env['TRAVIS_PULL_REQUEST_SHA']);
+  return database.ref(FIREBASE_REPORT).child(prNumber).update({
+    'commit': process.env['TRAVIS_COMMIT'],
+    'sha': process.env['TRAVIS_PULL_REQUEST_SHA'],
+    'travis': process.env['TRAVIS_JOB_ID'],
+  });
 }
 
 /** Get a list of filenames from firebase database. */