[telemetry] Create BrowserTestCase to reuse the browser for browser_unittest.

tools/telemetry/telemetry/unittest/browser_test_case.py

Index: tools/telemetry/telemetry/unittest/browser_test_case.py
diff --git a/tools/telemetry/telemetry/unittest/browser_test_case.py b/tools/telemetry/telemetry/unittest/browser_test_case.py
new file mode 100644
index 0000000000000000000000000000000000000000..c824e74c5bed2b1a8c8c9c42527976b31036b57f
--- /dev/null
+++ b/tools/telemetry/telemetry/unittest/browser_test_case.py
@@ -0,0 +1,45 @@
+# 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 os
+import unittest
+
+from telemetry.core import browser_finder
+from telemetry.unittest import options_for_unittests
+from telemetry.util import path
+
+
+class BrowserTestCase(unittest.TestCase):
+  @classmethod
+  def setUpClass(cls):
+    options = options_for_unittests.GetCopy()
+    cls.CustomizeBrowserOptions(options.browser_options)
+    browser_to_create = browser_finder.FindBrowser(options)
+    if not browser_to_create:
+      raise Exception('No browser found, cannot continue test.')
+
+    cls._browser = None
+    try:
+      cls._browser = browser_to_create.Create()
+      cls._browser.Start()
+    except:
+      cls.tearDownClass()
+      raise
+
+  @classmethod
+  def tearDownClass(cls):
+    if cls._browser:
+      cls._browser.Close()
+      cls._browser = None
+
+  @classmethod
+  def CustomizeBrowserOptions(cls, options):
+    """Override to add test-specific options to the BrowserOptions object"""
+    pass
+
+  @classmethod
+  def UrlOfUnittestFile(cls, filename):
+    cls._browser.SetHTTPServerDirectories(path.GetUnittestDataDir())
+    file_path = os.path.join(path.GetUnittestDataDir(), filename)
+    return cls._browser.http_server.UrlOf(file_path)