Script for auto-rolling chromium_revision in DEPS.

The previous script only looked up the LKGR and generated a
commit message. This CL renames the script and makes it update
the DEPS file, commit locally, upload CL and send tryjobs.

BUG=4688
R=phoglund@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/50079004

Cr-Commit-Position: refs/heads/master@{#9284}

tools/autoroller/unittests/roll_chromium_revision_test.py

@@ -0,0 +1,83 @@
+#!/usr/bin/env python
+# Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+import os
+import shutil
+import sys
+import tempfile
+import unittest
+
+
+SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
+PARENT_DIR = os.path.join(SCRIPT_DIR, os.pardir)
+sys.path.append(PARENT_DIR)
+from roll_chromium_revision import ParseDepsDict, UpdateDeps, \
+    GetMatchingDepsEntries
+
+TEST_DATA_VARS = {
+  'extra_gyp_flag': '-Dextra_gyp_flag=0',
+  'chromium_git': 'https://chromium.googlesource.com',
+  'chromium_revision': '1b9c098a08e40114e44b6c1ec33ddf95c40b901d',
+}
+
+DEPS_ENTRIES = {
+  'src/build': 'https://build.com',
+  'src/buildtools': 'https://buildtools.com',
+  'src/testing/gtest': 'https://gtest.com',
+  'src/testing/gmock': 'https://gmock.com',
+}
+
+
+class TestRollChromiumRevision(unittest.TestCase):
+  def setUp(self):
+    self._output_dir = tempfile.mkdtemp()
+    shutil.copy(os.path.join(SCRIPT_DIR, 'DEPS'), self._output_dir)
+    self._deps_filename = os.path.join(self._output_dir, 'DEPS')
+
+  def tearDown(self):
+    shutil.rmtree(self._output_dir, ignore_errors=True)
+
+  def testUpdateDeps(self):
+    new_rev = 'aaaaabbbbbcccccdddddeeeeefffff0000011111'
+
+    current_rev = TEST_DATA_VARS['chromium_revision']
+    UpdateDeps(self._deps_filename, current_rev, new_rev)
+    with open(self._deps_filename) as deps_file:
+      deps_contents = deps_file.read()
+      self.assertTrue(new_rev in deps_contents,
+                      'Failed to find %s in\n%s' % (new_rev, deps_contents))
+
+  def testParseDepsDict(self):
+    with open(self._deps_filename) as deps_file:
+      deps_contents = deps_file.read()
+    local_scope = ParseDepsDict(deps_contents)
+    vars_dict = local_scope['vars']
+
+    def assertVar(variable_name):
+      self.assertEquals(vars_dict[variable_name], TEST_DATA_VARS[variable_name])
+    assertVar('extra_gyp_flag')
+    assertVar('chromium_git')
+    assertVar('chromium_revision')
+
+  def testGetMatchingDepsEntriesReturnsPathInSimpleCase(self):
+    entries = GetMatchingDepsEntries(DEPS_ENTRIES, 'src/testing/gtest')
+    self.assertEquals(len(entries), 1)
+    self.assertEquals(entries[0], DEPS_ENTRIES['src/testing/gtest'])
+
+  def testGetMatchingDepsEntriesHandlesSimilarStartingPaths(self):
+    entries = GetMatchingDepsEntries(DEPS_ENTRIES, 'src/testing')
+    self.assertEquals(len(entries), 2)
+
+  def testGetMatchingDepsEntriesHandlesTwoPathsWithIdenticalFirstParts(self):
+    entries = GetMatchingDepsEntries(DEPS_ENTRIES, 'src/build')
+    self.assertEquals(len(entries), 1)
+    self.assertEquals(entries[0], DEPS_ENTRIES['src/build'])
+
+if __name__ == '__main__':
+  unittest.main()