[Swarming] Speed up test262 upload/download.

test/test262/testcfg.py

Index: test/test262/testcfg.py
diff --git a/test/test262/testcfg.py b/test/test262/testcfg.py
index f222e1e37d9e6e37369249d73f06c22d1db7c0d6..b5ad30949d8c3ae337128bfb17f47180fc34a8d0 100644
--- a/test/test262/testcfg.py
+++ b/test/test262/testcfg.py
@@ -39,6 +39,8 @@ from testrunner.local import testsuite
 from testrunner.local import utils
 from testrunner.objects import testcase
 
+ARCHIVE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "data.tar")
+
 TEST_262_HARNESS_FILES = ["sta.js", "assert.js"]
 
 TEST_262_SUITE_PATH = ["data", "test"]
@@ -199,6 +201,11 @@ class Test262TestSuite(testsuite.TestSuite):
       for f in archive_files:
         os.remove(os.path.join(self.root, f))
 
+    print "Extracting archive..."
+    tar = tarfile.open(ARCHIVE)
+    tar.extractall(path=os.path.dirname(ARCHIVE))
+    tar.close()
+
 
 def GetSuite(name, root):
   return Test262TestSuite(name, root)