[Swarming] Speed up test262 upload/download.

This experimentally implements taring/untaring the test data
for test262 on the v8-side before test isolation and when
running the tests.

It archives on demand only if the tar is outdated compared
to the contained files. This comes with a cost of ~1s extra
to run gyp on linux and ~6s extra on windows. Ninja is
lightning fast afterwards in detecting changes. Also, we
archive only when test_isolation_mode is set and when
the test262_run target is required.

The archiving itself costs ~30s on all platforms. But as the
files will change seldom this shouldn't have a big impact.

Extraction on the test runner side is below 2s on mac and
linux. The speedup is enormous. Around 5 minutes were spent
on download on swarming slaves before, which is now only
a few seconds. So total test time for release (no variants),
e.g. goes from 8 to 3 minutes.

BUG=chromium:535160
LOG=n

Review URL: https://codereview.chromium.org/1713993002

Cr-Commit-Position: refs/heads/master@{#34155}

.gitignore

@@ -59,6 +59,7 @@ shell_g
 /test/promises-aplus/sinon
 /test/simdjs/data
 /test/test262/data
+/test/test262/data.tar
 /testing/gmock
 /testing/gtest
 /third_party

test/test262/archive.py

+#!/usr/bin/env python
+# Copyright 2016 the V8 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.
+
+import os
+import tarfile
+
+os.chdir(os.path.dirname(os.path.abspath(__file__)))
+
+def filter_git(tar_info):
+  if tar_info.name.startswith(os.path.join('data', '.git')):
+    return None
+  else:
+    return tar_info
+
+with tarfile.open('data.tar', 'w') as tar:
+  tar.add('data', filter=filter_git)

test/test262/list.py

+#!/usr/bin/env python
+# Copyright 2016 the V8 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.
+
+import os
+import tarfile
+
+os.chdir(os.path.dirname(os.path.abspath(__file__)))
+
+for root, dirs, files in os.walk("data"):
+  dirs[:] = [d for d in dirs if not d.endswith('.git')]
+  for name in files:
+    # These names are for gyp, which expects slashes on all platforms.
+    print('/'.join(root.split(os.sep) + [name]))

test/test262/test262.gyp

@@ -19,6 +19,14 @@
           'sources': [
             'test262.isolate',
           ],
+          'actions': [
+            {
+              'action_name': 'archive_test262',
+              'inputs': ['archive.py', '<!@(python list.py)'],
+              'outputs': ['data.tar'],
+              'action': ['python', 'archive.py'],
+            },
+          ],
         },
       ],
     }],

test/test262/test262.isolate

@@ -4,7 +4,10 @@
 {
   'variables': {
     'files': [
-      './',
+      'data.tar',
+      'harness-adapt.js',
+      'test262.status',
+      'testcfg.py',
     ],
   },
   'includes': [

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)