[Telemetry] Increase timeout after sending SIGTERM

telemetry/telemetry/internal/backends/chrome/desktop_browser_backend.py

Index: telemetry/telemetry/internal/backends/chrome/desktop_browser_backend.py
diff --git a/telemetry/telemetry/internal/backends/chrome/desktop_browser_backend.py b/telemetry/telemetry/internal/backends/chrome/desktop_browser_backend.py
index ca34f90eaecd85569196b5ff693aee4a19ea5f5c..0b7ac768dcc33d1cdca7158eb59209e86857ed12 100644
--- a/telemetry/telemetry/internal/backends/chrome/desktop_browser_backend.py
+++ b/telemetry/telemetry/internal/backends/chrome/desktop_browser_backend.py
@@ -616,7 +616,9 @@ class DesktopBrowserBackend(chrome_browser_backend.ChromeBrowserBackend):
     if self.IsBrowserRunning():
       self._proc.terminate()
       try:
-        py_utils.WaitFor(lambda: not self.IsBrowserRunning(), timeout=5)
+        # Increased from 5 to increase the likelihood of getting a strack trace.
+        # See https://github.com/catapult-project/catapult/issues/3074.
+        py_utils.WaitFor(lambda: not self.IsBrowserRunning(), timeout=20)
         self._proc = None
       except py_utils.TimeoutException:
         logging.warning('Failed to gracefully shutdown.')