[telemetry] Update examples so they work.

tools/telemetry/telemetry/unittest/system_stub.py

Index: tools/telemetry/telemetry/unittest/system_stub.py
diff --git a/tools/telemetry/telemetry/unittest/system_stub.py b/tools/telemetry/telemetry/unittest/system_stub.py
index 10ec1ce1fea7de0edb8785198cbe2244ce04be56..1e9ddb522dbbcbcab07fdc3178544bbd23269751 100644
--- a/tools/telemetry/telemetry/unittest/system_stub.py
+++ b/tools/telemetry/telemetry/unittest/system_stub.py
@@ -20,6 +20,7 @@ class Override(object):
              'open': OpenFunctionStub,
              'os': OsModuleStub,
              'perf_control': PerfControlModuleStub,
+             'raw_input': RawInputFunctionStub,
              'subprocess': SubprocessModuleStub,
              'sys': SysModuleStub,
              'thermal_throttle': ThermalThrottleModuleStub,
@@ -219,6 +220,14 @@ class PerfControlModuleStub(object):
     self.PerfControl = PerfControlModuleStub.PerfControlStub
 
 
+class RawInputFunctionStub(object):
+  def __init__(self):
+    self.input = ''
+
+  def __call__(self, name, *args, **kwargs):
+    return self.input
+
+
 class SubprocessModuleStub(object):
   class PopenStub(object):
     def __init__(self):