Make it easy to use Web Page Replay with non-page_cycler tests.

chrome/test/functional/webpagereplay.py

Index: chrome/test/functional/webpagereplay.py
diff --git a/chrome/test/functional/webpagereplay.py b/chrome/test/functional/webpagereplay.py
index 082b079b363d871600a1f8bb3398d6b5586eede0..14a796aefb027343f05fdf675efd73726340591b 100755
--- a/chrome/test/functional/webpagereplay.py
+++ b/chrome/test/functional/webpagereplay.py
@@ -6,24 +6,22 @@
 """Start and stop Web Page Replay."""
 
 import logging
-import optparse
 import os
-import shutil
 import signal
 import subprocess
-import sys
-import tempfile
 import time
 import urllib
 
 
-USAGE = '%s [options] CHROME_EXE TEST_NAME' % os.path.basename(sys.argv[0])
-USER_DATA_DIR = '{TEMP}/webpagereplay_utils-chrome'
-
-# The port numbers must match those in chrome/test/perf/page_cycler_test.cc.
 HTTP_PORT = 8080
 HTTPS_PORT = 8413
 REPLAY_HOST='127.0.0.1'
+CHROME_FLAGS = [
+    '--host-resolver-rules=MAP * %s,EXCLUDE localhost' % REPLAY_HOST,
+    '--testing-fixed-http-port=%s' % HTTP_PORT,
+    '--testing-fixed-https-port=%s' % HTTPS_PORT,
+    '--ignore-certificate-errors',
+    ]
 
 
 class ReplayError(Exception):
@@ -135,3 +133,59 @@ class ReplayServer(object):
   def __exit__(self, unused_exc_type, unused_exc_val, unused_exc_tb):
     """Add support for with-statement."""
     self.StopServer()
+
+
+class ChromiumPaths(object):
+  """Convert POSIX-style Chromium tree paths to OS-specific absolute paths."""
+  _BASE_DIR = os.path.abspath(os.path.join(
+      os.path.dirname(__file__), os.pardir, os.pardir, os.pardir, os.pardir))
+
+  @classmethod
+  def Format(cls, relative_path, **kwargs):
+    return cls.AbsPath(relative_path.format(**kwargs))
+
+  @classmethod
+  def AbsPath(cls, relative_path):
+    return os.path.join(cls._BASE_DIR, *relative_path.split('/'))
+
+
+class PerfReplayServer(ReplayServer):
+  """Run tests with network simulation via Web Page Replay.
+
+  Web Page Replay is a proxy that can record and "replay" web pages with
+  simulated network characteristics -- without having to edit the pages
+  by hand. With WPR, tests can use "real" web content, and catch
+  performance issues that may result from introducing network delays and
+  bandwidth throttling.
+
+  Environment Variables:
+    WPR_ARCHIVE_PATH: path to alternate archive file (e.g. '/tmp/foo.wpr').
+    WPR_RECORD: if set, puts Web Page Replay in record mode instead of replay.
+    WPR_REPLAY_DIR: path to alternate Web Page Replay source (for development).
+  """
+  REPLAY_DIR = 'src/third_party/webpagereplay'
+  LOGS_DIR = 'src/webpagereplay_logs'
+
+  def __init__(self, archive_path):
+    self.is_record_mode = 'WPR_RECORD' in os.environ
+    archive_path = os.environ.get('WPR_ARCHIVE_PATH', archive_path)
+    replay_dir = os.environ.get('WPR_REPLAY_DIR',
+                                ChromiumPaths.AbsPath(self.REPLAY_DIR))
+    logs_dir = ChromiumPaths.AbsPath(self.LOGS_DIR)
+
+    replay_options = []
+    replay_options.append('--no-dns_forwarding')
+    if self.is_record_mode:
+      replay_options.append('--record')
+
+    assert archive_path, 'Archive path is not set.'
+    if self.is_record_mode:
+      archive_dir = os.path.dirname(archive_path)
+      assert os.path.exists(archive_dir), \
+          'Archive directory does not exist: %s' % archive_dir
+    else:
+      assert os.path.exists(archive_path), \
+          'Archive file path does not exist: %s' % archive_path
+
+    super(PerfWebPageReplay, self).__init__(
+        replay_dir, archive_path, logs_dir, replay_options)