[Telemetry] Reduce a websocket connection between telemetry & devtool browser target

telemetry/telemetry/internal/backends/chrome_inspector/system_info_backend.py

Index: telemetry/telemetry/internal/backends/chrome_inspector/system_info_backend.py
diff --git a/telemetry/telemetry/internal/backends/chrome_inspector/system_info_backend.py b/telemetry/telemetry/internal/backends/chrome_inspector/system_info_backend.py
new file mode 100644
index 0000000000000000000000000000000000000000..00d390fc7d69cc5a0c33234699776bbbc1503790
--- /dev/null
+++ b/telemetry/telemetry/internal/backends/chrome_inspector/system_info_backend.py
@@ -0,0 +1,23 @@
+# Copyright 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from telemetry.internal.platform import system_info
+from telemetry.internal.util import camel_case
+
+
+class SystemInfoBackend(object):
+  def __init__(self, inspector_socket):
+    self._inspector_socket = inspector_socket
+
+  def GetSystemInfo(self, timeout):
+    assert self._inspector_socket
+    req = {'method': 'SystemInfo.getInfo'}
+    res = self._inspector_socket.SyncRequest(req, timeout)
+    if 'error' in res:
+      return None
+    return system_info.SystemInfo.FromDict(
+        camel_case.ToUnderscore(res['result']))
+
+  def Close(self):
+    self._inspector_socket = None