[telemetry] Refactoring of telemetry for the webdriver backend to land in.

tools/telemetry/telemetry/core/backends/browser_backend.py

Index: tools/telemetry/telemetry/core/backends/browser_backend.py
diff --git a/tools/telemetry/telemetry/core/backends/browser_backend.py b/tools/telemetry/telemetry/core/backends/browser_backend.py
new file mode 100644
index 0000000000000000000000000000000000000000..64b01e77892c8dd23a4fd08ed3065941645d8d3b
--- /dev/null
+++ b/tools/telemetry/telemetry/core/backends/browser_backend.py
@@ -0,0 +1,96 @@
+# Copyright (c) 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.core import util
+from telemetry.core import web_contents
+
+
+class ExtensionsNotSupportedException(Exception):
+  pass
+
+class BrowserBackend(object):
+  """A base class for browser backends."""
+
+  WEBPAGEREPLAY_HOST = '127.0.0.1'
+
+  def __init__(self, is_content_shell, supports_extensions, options,
+               tab_list_backend):
+    self.browser_type = options.browser_type
+    self.is_content_shell = is_content_shell
+    self._supports_extensions = supports_extensions
+    self.options = options
+    self._browser = None
+    self._tab_list_backend = tab_list_backend(self)
+
+  def AddReplayServerOptions(self, options):
+    pass
+
+  def SetBrowser(self, browser):
+    self._browser = browser
+    self._tab_list_backend.Init()
+
+  @property
+  def browser(self):
+    return self._browser
+
+  @property
+  def supports_extensions(self):
+    """True if this browser backend supports extensions."""
+    return self._supports_extensions
+
+  @property
+  def wpr_mode(self):
+    return self.options.wpr_mode
+
+  @property
+  def supports_tab_control(self):
+    raise NotImplementedError()
+
+  @property
+  def tab_list_backend(self):
+    return self._tab_list_backend
+
+  @property
+  def supports_tracing(self):
+    raise NotImplementedError()
+
+  def StartTracing(self, custom_categories=None,
+                   timeout=web_contents.DEFAULT_WEB_CONTENTS_TIMEOUT):
+    raise NotImplementedError()
+
+  def StopTracing(self):
+    raise NotImplementedError()
+
+  def GetTraceResultAndReset(self):
+    raise NotImplementedError()
+
+  def GetRemotePort(self, _):
+    return util.GetAvailableLocalPort()
+
+  def Start(self):
+    raise NotImplementedError()
+
+  def CreateForwarder(self, *port_pairs):
+    raise NotImplementedError()
+
+  def IsBrowserRunning(self):
+    raise NotImplementedError()
+
+  def GetStandardOutput(self):
+    raise NotImplementedError()
+
+  def GetStackTrace(self):
+    raise NotImplementedError()
+
+class DoNothingForwarder(object):
+  def __init__(self, *port_pairs):
+    self._host_port = port_pairs[0].local_port
+
+  @property
+  def url(self):
+    assert self._host_port
+    return 'http://127.0.0.1:%i' % self._host_port
+
+  def Close(self):
+    self._host_port = None