Make FYI bot test script exit with nonzero status if any tests fail.

buildbot/buildbot_pnacl_toolchain_tests.sh

Index: buildbot/buildbot_pnacl_toolchain_tests.sh
diff --git a/buildbot/buildbot_pnacl_toolchain_tests.sh b/buildbot/buildbot_pnacl_toolchain_tests.sh
index 28f79843627cd06e9e8e77b466d7f68613504bf5..c21fc7761cd6650cb24131582fcad67c5e2c8b1f 100755
--- a/buildbot/buildbot_pnacl_toolchain_tests.sh
+++ b/buildbot/buildbot_pnacl_toolchain_tests.sh
@@ -39,6 +39,8 @@ export PNACL_BUILDBOT=true
 # by long periods without console output.
 export PNACL_VERBOSE=true
 
+EXIT_STATUS=0
+
 clobber() {
   echo @@@BUILD_STEP clobber@@@
   rm -rf scons-out
@@ -51,6 +53,7 @@ clobber() {
 
 handle-error() {
   echo "@@@STEP_FAILURE@@@"
+  EXIT_STATUS=1
 }
 
 ignore-error() {
@@ -253,6 +256,7 @@ tc-test-bot() {
     fi
 
   done
+  exit $EXIT_STATUS
 }