applaunch: do not attempt to uninstall uiauto apk

applaunch  users the UI automation of the guest workload to detect
launch completion. However, the guest's automaiton apk is pushed to the
target and loaded via DexLoader; it is never actually installed;
therefore, it should not be uninstalled when running guest's teardown.

wlauto/common/android/workload.py

@@ -72,6 +72,7 @@ class UiAutomatorWorkload(Workload):
     # Can be overidden by subclasses to adjust to run time of specific
     # benchmarks.
     run_timeout = 10 * 60  # seconds
+    uninstall_uiauto_apk = True
 
     def __init__(self, device, _call_super=True, **kwargs):  # pylint: disable=W0613
         if _call_super:
@@ -118,7 +119,8 @@ class UiAutomatorWorkload(Workload):
         pass
 
     def teardown(self, context):
-        self.device.uninstall(self.uiauto_package)
+        if self.uninstall_uiauto_apk:
+            self.device.uninstall(self.uiauto_package)
 
     def validate(self):
         if not self.uiauto_file:

wlauto/workloads/applaunch/__init__.py

@@ -112,6 +112,10 @@ class Applaunch(AndroidUxPerfWorkload):
         self.workload_params['markers_enabled'] = True
         self.workload = loader.get_workload(self.workload_name, self.device,
                                             **self.workload_params)
+
+        # This workload's uiauto apk will not be installed -- automation will be loaded directly form a path
+        # so do not uninstall during teardown
+        self.workload.uninstall_uiauto_apk = False
         self.init_workload_resources(context)
         self.package = self.workload.package