[date] Add ICU backend for timezone info behind a flag

tools/testrunner/objects/testcase.py

Index: tools/testrunner/objects/testcase.py
diff --git a/tools/testrunner/objects/testcase.py b/tools/testrunner/objects/testcase.py
index 00722d768b3b44ebed23a9af8ec2524a463b0da5..37e3cb4ec2bd1465a55dec97f8b3341348d92989 100644
--- a/tools/testrunner/objects/testcase.py
+++ b/tools/testrunner/objects/testcase.py
@@ -41,11 +41,13 @@ class TestCase(object):
     self.id = None  # int, used to map result back to TestCase instance
     self.duration = None  # assigned during execution
     self.run = 1  # The nth time this test is executed.
+    self.env = {}
 
   def CopyAddingFlags(self, variant, flags):
     copy = TestCase(self.suite, self.path, variant, self.flags + flags,
                     self.override_shell)
     copy.outcomes = self.outcomes
+    copy.env = self.env
     return copy
 
   def PackTask(self):
@@ -56,7 +58,7 @@ class TestCase(object):
     assert self.id is not None
     return [self.suitename(), self.path, self.variant, self.flags,
             self.override_shell, list(self.outcomes or []),
-            self.id]
+            self.id, self.env]
 
   @staticmethod
   def UnpackTask(task):
@@ -66,6 +68,7 @@ class TestCase(object):
     test.outcomes = frozenset(task[5])
     test.id = task[6]
     test.run = 1
+    test.env = task[7]
     return test
 
   def SetSuiteObject(self, suites):