DataReductionProxy proto change to use exp=force_lite_page directive

tools/chrome_proxy/webdriver/lite_page.py

Index: tools/chrome_proxy/webdriver/lite_page.py
diff --git a/tools/chrome_proxy/webdriver/lite_page.py b/tools/chrome_proxy/webdriver/lite_page.py
index 101d563f8ec334c1f2adae9ea5b3cfc246fdc452..b20004df76ffa45d12ffad0fe775c46acb156b21 100644
--- a/tools/chrome_proxy/webdriver/lite_page.py
+++ b/tools/chrome_proxy/webdriver/lite_page.py
@@ -10,9 +10,9 @@ import time
 
 class LitePage(IntegrationTest):
 
-  # Checks that a Lite Page is served and that the ignore_preview_blacklist
-  # experiment is being used.
-  def testLitePage(self):
+  # Checks that a Lite Page is served and the force_lite_page experiment
+  # directive is provided when always-on.
+  def testLitePageForcedExperiment(self):
     # If it was attempted to run with another experiment, skip this test.
     if common.ParseFlags().browser_args and ('--data-reduction-proxy-experiment'
         in common.ParseFlags().browser_args):
@@ -32,8 +32,10 @@ class LitePage(IntegrationTest):
           continue
         if response.url.startswith('data:'):
           continue
-        self.assertIn('exp=ignore_preview_blacklist',
-          response.request_headers['chrome-proxy'])
+        # Main resource should force lite page.
+        if response.url.endswith('html'):
+          self.assertIn('exp=force_lite_page',
+                        response.request_headers['chrome-proxy'])
         if (self.checkLitePageResponse(response)):
           lite_page_responses = lite_page_responses + 1
 
@@ -64,8 +66,6 @@ class LitePage(IntegrationTest):
           continue
         if response.url.startswith('data:'):
           continue
-        self.assertIn('exp=ignore_preview_blacklist',
-          response.request_headers['chrome-proxy'])
         if (self.checkLitePageResponse(response)):
           lite_page_responses = lite_page_responses + 1
       self.assertEqual(1, lite_page_responses)