Revert of Refactor source_control.py and add a test.

tools/auto_bisect/bisect_perf_regression_test.py

Index: tools/auto_bisect/bisect_perf_regression_test.py
diff --git a/tools/auto_bisect/bisect_perf_regression_test.py b/tools/auto_bisect/bisect_perf_regression_test.py
index a4ba38984571be69f262544743ab66e13beb6708..0e56e443e1afe033effa13f89faf2d72cf4a64f1 100644
--- a/tools/auto_bisect/bisect_perf_regression_test.py
+++ b/tools/auto_bisect/bisect_perf_regression_test.py
@@ -14,7 +14,7 @@
 import bisect_perf_regression
 import bisect_results
 import mock
-import source_control
+import source_control as source_control_module
 
 
 def _GetBisectPerformanceMetricsInstance():
@@ -29,8 +29,10 @@
     'bad_revision': 280005,
   }
   bisect_options = bisect_perf_regression.BisectOptions.FromDict(options_dict)
+  source_control = source_control_module.DetermineAndCreateSourceControl(
+      bisect_options)
   bisect_instance = bisect_perf_regression.BisectPerformanceMetrics(
-      bisect_options)
+      source_control, bisect_options)
   return bisect_instance
 
 
@@ -205,10 +207,12 @@
     """
     bisect_options = bisect_perf_regression.BisectOptions()
     bisect_options.output_buildbot_annotations = None
+    source_control = source_control_module.DetermineAndCreateSourceControl(
+        bisect_options)
     bisect_instance = bisect_perf_regression.BisectPerformanceMetrics(
-        bisect_options)
+        source_control, bisect_options)
     bisect_instance.opts.target_platform = target_platform
-    git_revision = source_control.ResolveToRevision(
+    git_revision = bisect_instance.source_control.ResolveToRevision(
         revision, 'chromium', bisect_perf_regression.DEPOT_DEPS_NAME, 100)
     depot = 'chromium'
     command = bisect_instance.GetCompatibleCommand(
@@ -271,25 +275,30 @@
       shutil.rmtree = old_rmtree
 
   def testGetCommitPosition(self):
+    bisect_instance = _GetBisectPerformanceMetricsInstance()
     cp_git_rev = '7017a81991de983e12ab50dfc071c70e06979531'
-    self.assertEqual(291765, source_control.GetCommitPosition(cp_git_rev))
+    self.assertEqual(
+        291765, bisect_instance.source_control.GetCommitPosition(cp_git_rev))
 
     svn_git_rev = 'e6db23a037cad47299a94b155b95eebd1ee61a58'
-    self.assertEqual(291467, source_control.GetCommitPosition(svn_git_rev))
+    self.assertEqual(
+        291467, bisect_instance.source_control.GetCommitPosition(svn_git_rev))
 
   def testGetCommitPositionForV8(self):
     bisect_instance = _GetBisectPerformanceMetricsInstance()
     v8_rev = '21d700eedcdd6570eff22ece724b63a5eefe78cb'
     depot_path = os.path.join(bisect_instance.src_cwd, 'v8')
     self.assertEqual(
-        23634, source_control.GetCommitPosition(v8_rev, depot_path))
+        23634,
+        bisect_instance.source_control.GetCommitPosition(v8_rev, depot_path))
 
   def testGetCommitPositionForWebKit(self):
     bisect_instance = _GetBisectPerformanceMetricsInstance()
     wk_rev = 'a94d028e0f2c77f159b3dac95eb90c3b4cf48c61'
     depot_path = os.path.join(bisect_instance.src_cwd, 'third_party', 'WebKit')
     self.assertEqual(
-        181660, source_control.GetCommitPosition(wk_rev, depot_path))
+        181660,
+        bisect_instance.source_control.GetCommitPosition(wk_rev, depot_path))
 
   def testUpdateDepsContent(self):
     bisect_instance = _GetBisectPerformanceMetricsInstance()