Refactor websocket connections logic with devtool Storage domain to a separate class

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 2547056dbc53c4b7c5f85c0ccf1977902b06f04e..1765f12ddaec552dd958f7ef9b9148e027d03c26 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_storage
 from telemetry.internal.backends.chrome_inspector import inspector_websocket
 from telemetry.internal.backends.chrome_inspector import websocket
 from telemetry.util import js_template
@@ -71,6 +72,7 @@ class InspectorBackend(object):
       self._page = inspector_page.InspectorPage(
           self._websocket, timeout=timeout)
       self._runtime = inspector_runtime.InspectorRuntime(self._websocket)
+      self._storage = inspector_storage.InspectorStorage(self._websocket)
     except (websocket.WebSocketException, exceptions.TimeoutException,
             py_utils.TimeoutException) as e:
       self._ConvertExceptionFromInspectorWebsocket(e)
@@ -108,6 +110,9 @@ class InspectorBackend(object):
   def debugger_url(self):
     return self._context['webSocketDebuggerUrl']
 
+  def ClearDataForOrigin(self, url, timeout):
+    self._storage.ClearDataForOrigin(url, timeout)
+
   def GetWebviewInspectorBackends(self):
     """Returns a list of InspectorBackend instances associated with webviews.