Add tab.StopAllServiceWorkers()

telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py

Index: telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py
diff --git a/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py b/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py
index 1765f12ddaec552dd958f7ef9b9148e027d03c26..6b704ff0a0f07031ee7c9523772fa052e55283db 100644
--- a/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py
+++ b/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py
@@ -16,6 +16,7 @@ from telemetry.internal.backends.chrome_inspector import inspector_console
 from telemetry.internal.backends.chrome_inspector import inspector_memory
 from telemetry.internal.backends.chrome_inspector import inspector_page
 from telemetry.internal.backends.chrome_inspector import inspector_runtime
+from telemetry.internal.backends.chrome_inspector import inspector_serviceworker
 from telemetry.internal.backends.chrome_inspector import inspector_storage
 from telemetry.internal.backends.chrome_inspector import inspector_websocket
 from telemetry.internal.backends.chrome_inspector import websocket
@@ -72,6 +73,8 @@ class InspectorBackend(object):
       self._page = inspector_page.InspectorPage(
           self._websocket, timeout=timeout)
       self._runtime = inspector_runtime.InspectorRuntime(self._websocket)
+      self._serviceworker = inspector_serviceworker.InspectorServiceWorker(
+          self._websocket, timeout=timeout)
       self._storage = inspector_storage.InspectorStorage(self._websocket)
     except (websocket.WebSocketException, exceptions.TimeoutException,
             py_utils.TimeoutException) as e:
@@ -110,6 +113,9 @@ class InspectorBackend(object):
   def debugger_url(self):
     return self._context['webSocketDebuggerUrl']
 
+  def StopAllServiceWorkers(self, timeout):
+    self._serviceworker.StopAllWorkers(timeout)
+
   def ClearDataForOrigin(self, url, timeout):
     self._storage.ClearDataForOrigin(url, timeout)