Create AndroidCommandLineBackend to handle setting up cmdline args

tools/telemetry/telemetry/core/backends/android_command_line_backend_unittest.py

+# 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.
+
+import unittest
+
+from telemetry.core.backends import android_command_line_backend
+
+
+class AndroidCommandLineBackendTest(unittest.TestCase):
+
+  def testQuoteIfNeededNoEquals(self):
+    string = 'value'
+    self.assertEqual(string,
+                     android_command_line_backend._QuoteIfNeeded(string))
+
+  def testQuoteIfNeededNoSpaces(self):
+    string = 'key=valueA'
+    self.assertEqual(string,
+                     android_command_line_backend._QuoteIfNeeded(string))
+
+  def testQuoteIfNeededAlreadyQuoted(self):
+    string = "key='valueA valueB'"
+    self.assertEqual(string,
+                     android_command_line_backend._QuoteIfNeeded(string))
+
+  def testQuoteIfNeeded(self):
+    string = 'key=valueA valueB'
+    expected_output = "key='valueA valueB'"
+    self.assertEqual(expected_output,
+                     android_command_line_backend._QuoteIfNeeded(string))