Add tab.StopAllServiceWorkers()

telemetry/telemetry/internal/browser/tab.py

Index: telemetry/telemetry/internal/browser/tab.py
diff --git a/telemetry/telemetry/internal/browser/tab.py b/telemetry/telemetry/internal/browser/tab.py
index f67b9939f56be73ef3b86400c254bf2e09836f11..01ed335b0053448c8d304c9333abe8b316ec5114 100644
--- a/telemetry/telemetry/internal/browser/tab.py
+++ b/telemetry/telemetry/internal/browser/tab.py
@@ -294,3 +294,27 @@ class Tab(web_contents.WebContents):
     }, timeout)
     if 'error' in res:
       raise exceptions.StoryActionError(res['error']['message'])
+
+  def EnableServiceWorker(self, timeout=DEFAULT_TAB_TIMEOUT):

[nednguyen, 2017/09/22 11:07:34]

Can you move these to inspector_backend? Then these two methods just call:
inspector_backend.EnableServiceWorker & inspector_backend.StopServiceWorker 

[yukiy, 2017/09/25 01:23:13]

Done.

+    """Enables devtools for ServiceWorker domain.
+
+    Raises:
+      exceptions.StoryActionError
+    """
+    res = self._inspector_backend._websocket.SyncRequest({
+        'method': 'ServiceWorker.enable'
+    }, timeout)
+    if 'error' in res:
+      raise exceptions.StoryActionError(res['error']['message'])
+
+  def StopServiceWorker(self, timeout=DEFAULT_TAB_TIMEOUT):
+    """Stops all service workers.
+
+    Raises:
+      exceptions.StoryActionError
+    """
+    res = self._inspector_backend._websocket.SyncRequest({
+        'method': 'ServiceWorker.stopAllWorkers'
+    }, timeout)
+    if 'error' in res:
+      raise exceptions.StoryActionError(res['error']['message'])