Added integration tests for falling back from the HTTP proxy to direct.

tools/chrome_proxy/integration_tests/chrome_proxy_measurements.py

Index: tools/chrome_proxy/integration_tests/chrome_proxy_measurements.py
diff --git a/tools/chrome_proxy/integration_tests/chrome_proxy_measurements.py b/tools/chrome_proxy/integration_tests/chrome_proxy_measurements.py
index 00ba5b57eb48be98fe3ec930371036a6123f0548..ae3b8850128687d9c6c6855d7228ce4afc8b06c3 100644
--- a/tools/chrome_proxy/integration_tests/chrome_proxy_measurements.py
+++ b/tools/chrome_proxy/integration_tests/chrome_proxy_measurements.py
@@ -260,6 +260,26 @@ class ChromeProxyClientVersion(ChromeProxyValidation):
     self._metrics.AddResultsForClientVersion(tab, results)
 
 
+class ChromeProxyHTTPToDirectFallback(ChromeProxyValidation):
+  """Correctness measurement for HTTP proxy fallback to direct."""
+
+  def __init__(self):
+    super(ChromeProxyHTTPToDirectFallback, self).__init__(
+        restart_after_each_page=True)
+
+  def WillNavigateToPage(self, page, tab):
+    super(ChromeProxyHTTPToDirectFallback, self).WillNavigateToPage(page, tab)
+    proxies = [
+        self._metrics.effective_proxies['proxy'],
+        self._metrics.effective_proxies['fallback'],
+        self._metrics.effective_proxies['direct']]
+    bad_proxies = [self._metrics.effective_proxies['proxy']]
+    self._metrics.VerifyProxyInfo(tab, proxies, bad_proxies)

[bolian, 2014/10/14 06:00:49]

Why there is bad proxy already before navigation?

[sclittle, 2014/10/14 17:36:45]

Added a comment.

In order to have the test run starting from the HTTP fallback proxy, the startup
URL for the page test is http://check.googlezip.net/fallback. So when Chrome is
started for the test, it's loaded with this fallback URL, then when that page
has fully loaded, it begins the test.

This check here is to verify that this is true before beginning the test proper.

+
+  def AddResults(self, tab, results):
+    self._metrics.AddResultsForHTTPToDirectFallback(tab, results)
+
+
 class ChromeProxySmoke(ChromeProxyValidation):
   """Smoke measurement for basic chrome proxy correctness."""