wa/workloads: Fix missing imports

wa/workloads/androbench/__init__.py

@@ -15,6 +15,7 @@
 import re
 
 from wa import ApkUiautoWorkload
+from wa.framework.exception import WorkloadError
 
 class Androbench(ApkUiautoWorkload):
 

wa/workloads/chrome/__init__.py

@@ -1,4 +1,5 @@
 from wa import Parameter, ApkUiautoWorkload
+from wa.framework.exception import WorkloadError
 
 
 class Chrome(ApkUiautoWorkload):

wa/workloads/geekbench/__init__.py

@@ -18,6 +18,7 @@ import os
 import re
 import tempfile
 import json
+from collections import defaultdict
 
 from wa import ApkUiautoWorkload, Parameter
 from wa.framework.exception import ConfigError, WorkloadError

wa/workloads/googlemaps/__init__.py

@@ -1,5 +1,5 @@
 from wa import Parameter, ApkUiautoWorkload
-
+from wa.framework.exception import WorkloadError
 
 class GoogleMaps(ApkUiautoWorkload):
 

wa/workloads/pcmark/__init__.py

@@ -17,6 +17,7 @@ import re
 import zipfile
 
 from wa import ApkUiautoWorkload
+from wa.framework.exception import WorkloadError
 
 class PcMark(ApkUiautoWorkload):
 

wa/workloads/speedometer/__init__.py

@@ -16,7 +16,7 @@ import os
 import re
 
 from wa import UiautoWorkload, Parameter
-from wa.framework.exception import ValidationError
+from wa.framework.exception import ValidationError, WorkloadError
 from wa.utils.types import list_of_strs
 from wa.utils.misc import unique
 

wa/workloads/stress_ng/__init__.py

@@ -18,6 +18,7 @@ import os
 import yaml
 
 from wa import Workload, Parameter, ConfigError, Executable
+from wa.framework.exception import WorkloadError
 from wa.utils.exec_control import once