Bug 1688669 - Do not sample stacks in marker tests r=canaltinova

Differential Revision: https://phabricator.services.mozilla.com/D102937

tools/profiler/tests/shared-head.js

@@ -40,6 +40,10 @@ function startProfiler(callersSettings) {
   );
 }
 
+function startProfilerForMarkerTests() {
+  startProfiler({ features: ["threads", "nostacksampling"] });
+}
+
 /**
  * This is a helper function be able to run `await wait(500)`. Unfortunately
  * this is needed as the act of collecting functions relies on the periodic

tools/profiler/tests/xpcshell/test_addProfilerMarker.js

@@ -85,7 +85,7 @@ add_task(async () => {
     return;
   }
 
-  startProfiler();
+  startProfilerForMarkerTests();
   startTime = Cu.now();
   while (Cu.now() < startTime + 1) {
     // Busy wait for 1ms to ensure the intentionally set start time of markers