Bug 1632391 - [raptor] Fix timeout handling when shutting down the application. r=perftest-reviewers,sparky

Sleeping a second and increasing the elapsed time by 1,
doesn't mean that exactly a second has been passed-by.

For a better timeout handling the end time has to be
calculated first, and then checked against.

Differential Revision: https://phabricator.services.mozilla.com/D72132

testing/raptor/raptor/webextension/base.py

@@ -99,7 +99,9 @@ class WebExtension(Perftest):
         # we also need to give time for results processing, not just page/browser cycles!
         timeout += 60
 
-        elapsed_time = 0
+        # stop 5 seconds early
+        end_time = time.time() + timeout - 5
+
         while not self.control_server._finished:
             # Ignore check if the control server shutdown the app
             if not self.control_server._is_shutting_down:
@@ -116,12 +118,13 @@ class WebExtension(Perftest):
                         self.cpu_profiler.generate_android_cpu_profile(test["name"])
 
                     self.control_server_wait_continue()
+
+            # Sleep for a moment to not check the process too often
             time.sleep(1)
+
             # we only want to force browser-shutdown on timeout if not in debug mode;
             # in debug-mode we leave the browser running (require manual shutdown)
-            if not self.debug_mode:
-                elapsed_time += 1
-                if elapsed_time > (timeout) - 5:  # stop 5 seconds early
+            if not self.debug_mode and end_time < time.time():
                 self.control_server.wait_for_quit()
 
                 if not self.control_server.is_webextension_loaded: