Enable build report upload on travis

Note that this also requires setting the CREDZ environment variable to the
contents of the service account credentials file (wrapped in single quotes for
shell command protection)

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=234993149

.travis.yml

@@ -11,6 +11,19 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+#
+# Collecting report files from a travis build to GCS requires setting the
+# "CREDZ" and "REPORT_GCS_BUCKET" environment variables in your travis
+# repository.
+#
+# The report bucket id should just be the bucket id without any scheme or path
+# (e.g. "my-bucket-name", not "gcs://my-bucket-name").  You'll want to select
+# "Display value in build log", otherwise travis will hide the bucket name in
+# the URL that is displayed.
+#
+# The CREDZ variable should be the contents of a json credentials file for
+# a service account with write access to the bucket, escaped for bash shell
+# usage (usually just wrapping it in single quotes should suffice).
 
 language: java
 install: true
@@ -41,4 +54,6 @@ env:
 # directory.
 # The "travis_wait 45" lets our build spend up to 45 minutes without writing
 # output, instead of the default 10.
-script: cd gradle && chmod 755 ./gradlew && travis_wait 45 ./gradlew build
+# See notes on the CREDZ and REPORT_GCS_BUCKET environment variable in the
+# comments at the top of the file.
+script: cd gradle && echo "$CREDZ" >credz.json && chmod 755 ./gradlew && travis_wait 45 ./gradlew build  -P gcsBucket="$REPORT_GCS_BUCKET" -P gcsCredentialsFile=credz.json -P gcsMultithreadedUpload=yes