Move top_20 tests to a separate suite

tools/chrome_proxy/common/chrome_proxy_measurements.py

Index: tools/chrome_proxy/common/chrome_proxy_measurements.py
diff --git a/tools/chrome_proxy/common/chrome_proxy_measurements.py b/tools/chrome_proxy/common/chrome_proxy_measurements.py
new file mode 100644
index 0000000000000000000000000000000000000000..ab8fd671a5e8897becdf4d91d088673dc910de3a
--- /dev/null
+++ b/tools/chrome_proxy/common/chrome_proxy_measurements.py
@@ -0,0 +1,65 @@
+# Copyright 2014 The Chromium 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 logging
+
+from common import chrome_proxy_metrics as metrics
+from telemetry.core import exceptions
+from telemetry.page import page_test
+
+class ChromeProxyValidation(page_test.PageTest):
+  """Base class for all chrome proxy correctness measurements."""
+
+  # Value of the extra via header. |None| if no extra via header is expected.
+  extra_via_header = None
+
+  def __init__(self, restart_after_each_page=False, metrics=None):
+    super(ChromeProxyValidation, self).__init__(
+        needs_browser_restart_after_each_page=restart_after_each_page)
+    self._metrics = metrics
+    self._page = None
+    # Whether a timeout exception is expected during the test.
+    self._expect_timeout = False
+
+  def CustomizeBrowserOptions(self, options):
+    # Enable the chrome proxy (data reduction proxy).
+    options.AppendExtraBrowserArgs('--enable-spdy-proxy-auth')
+
+  def WillNavigateToPage(self, page, tab):
+    tab.ClearCache(force=True)
+    assert self._metrics
+    self._metrics.Start(page, tab)
+
+  def ValidateAndMeasurePage(self, page, tab, results):
+    self._page = page
+    # Wait for the load event.
+    tab.WaitForJavaScriptExpression('performance.timing.loadEventStart', 300)
+    assert self._metrics
+    self._metrics.Stop(page, tab)
+    if ChromeProxyValidation.extra_via_header:
+      self._metrics.AddResultsForExtraViaHeader(
+          tab, results, ChromeProxyValidation.extra_via_header)
+    self.AddResults(tab, results)
+
+  def AddResults(self, tab, results):
+    raise NotImplementedError
+
+  def StopBrowserAfterPage(self, browser, page):  # pylint: disable=W0613
+    if hasattr(page, 'restart_after') and page.restart_after:
+      return True
+    return False
+
+  def RunNavigateSteps(self, page, tab):
+    # The redirect from safebrowsing causes a timeout. Ignore that.
+    try:
+      super(ChromeProxyValidation, self).RunNavigateSteps(page, tab)
+      if self._expect_timeout:
+        raise metrics.ChromeProxyMetricException, (
+            'Timeout was expected, but did not occur')
+    except exceptions.TimeoutException as e:
+      if self._expect_timeout:
+        logging.warning('Navigation timeout on page %s',
+                        page.name if page.name else page.url)
+      else:
+        raise e