[telemetry] Add webdriver_ie_backend.

tools/telemetry/telemetry/core/backends/webdriver/webdriver_browser_backend.py

Index: tools/telemetry/telemetry/core/backends/webdriver/webdriver_browser_backend.py
diff --git a/tools/telemetry/telemetry/core/backends/webdriver/webdriver_browser_backend.py b/tools/telemetry/telemetry/core/backends/webdriver/webdriver_browser_backend.py
index 2eb01f2eb271fc273328694de3595c1024f3a2b2..88b8018c8411b4d68560d48cb183b7d84e252a35 100644
--- a/tools/telemetry/telemetry/core/backends/webdriver/webdriver_browser_backend.py
+++ b/tools/telemetry/telemetry/core/backends/webdriver/webdriver_browser_backend.py
@@ -45,7 +45,7 @@ class WebDriverBrowserBackend(browser_backend.BrowserBackend):
     # webdriver API.
     return False
 
-  def GetProcessName(self, _):
+  def GetProcessName(self, cmd_line):
     # Leave implementation details to subclass as process name depends on the
     # type of browser.
     raise NotImplementedError()
@@ -62,9 +62,5 @@ class WebDriverBrowserBackend(browser_backend.BrowserBackend):
     # Assume the browser is running if not explicitly closed.
     return self._driver is not None
 
-  def GetStandardOutput(self):
-    # TODO(chrisgao): check if python client can get stdout of browsers.
-    return ''
-
   def __del__(self):
     self.Close()