Create DevToolsHttp and basic DevToolsClientBackend.

tools/telemetry/telemetry/core/backends/chrome_inspector/devtools_http_unittest.py

Index: tools/telemetry/telemetry/core/backends/chrome_inspector/devtools_http_unittest.py
diff --git a/tools/telemetry/telemetry/core/backends/chrome_inspector/devtools_http_unittest.py b/tools/telemetry/telemetry/core/backends/chrome_inspector/devtools_http_unittest.py
new file mode 100644
index 0000000000000000000000000000000000000000..6e854f7751a29aca46fc7581bbe1aed4c986b365
--- /dev/null
+++ b/tools/telemetry/telemetry/core/backends/chrome_inspector/devtools_http_unittest.py
@@ -0,0 +1,53 @@
+# Copyright 2014 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 httplib
+import socket
+import unittest
+import urllib2
+
+from telemetry.core.backends.chrome_inspector import devtools_http
+
+
+_original_proxy_handler = urllib2.ProxyHandler
+
+class DevToolsHttpTest(unittest.TestCase):
+
+  def testUrlError(self):
+    class FakeProxyHandler(object):
+      def __init__(self, *_, **__):
+        raise urllib2.URLError('Test')
+
+    urllib2.ProxyHandler = FakeProxyHandler
+    try:
+      with self.assertRaises(devtools_http.DevToolsClientUrlError):
+        devtools_http.DevToolsHttp(1000).Request('')
+    finally:
+      urllib2.ProxyHandler = _original_proxy_handler
+
+  def testSocketError(self):
+    class FakeProxyHandler(object):
+      def __init__(self, *_, **__):
+        raise socket.error
+
+    urllib2.ProxyHandler = FakeProxyHandler
+    try:
+      with self.assertRaises(devtools_http.DevToolsClientConnectionError) as e:
+        devtools_http.DevToolsHttp(1000).Request('')
+      self.assertNotIsInstance(e, devtools_http.DevToolsClientUrlError)
+    finally:
+      urllib2.ProxyHandler = _original_proxy_handler
+
+  def testBadStatusLine(self):
+    class FakeProxyHandler(object):
+      def __init__(self, *_, **__):
+        raise httplib.BadStatusLine('Test')
+
+    urllib2.ProxyHandler = FakeProxyHandler
+    try:
+      with self.assertRaises(devtools_http.DevToolsClientConnectionError) as e:
+        devtools_http.DevToolsHttp(1000).Request('')
+      self.assertNotIsInstance(e, devtools_http.DevToolsClientUrlError)
+    finally:
+      urllib2.ProxyHandler = _original_proxy_handler