[subresource_filter] Add metrics for all NavigationThrottle delays

components/subresource_filter/content/browser/subframe_navigation_filtering_throttle_unittest.cc

 // Copyright 2017 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.
 
 #include "components/subresource_filter/content/browser/subframe_navigation_filtering_throttle.h"
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
+#include "base/test/histogram_tester.h"
 #include "components/subresource_filter/content/browser/async_document_subresource_filter.h"
 #include "components/subresource_filter/content/browser/async_document_subresource_filter_test_utils.h"
 #include "components/subresource_filter/core/common/activation_level.h"
 #include "components/subresource_filter/core/common/activation_state.h"
 #include "components/subresource_filter/core/common/test_ruleset_creator.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/test/navigation_simulator.h"
 #include "content/public/test/test_renderer_host.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 159 matching lines @@
       ->SimulateNavigationStart(test_url);
   InitializeDocumentSubresourceFilter(GURL("https://example.test"));
   content::RenderFrameHostTester::For(parent_subframe)
       ->SimulateNavigationCommit(test_url);
 
   CreateTestSubframeAndInitNavigation(
       GURL("https://example.test/disallowed.html"), parent_subframe);
   SimulateStartAndExpectResult(content::NavigationThrottle::CANCEL);
 }
 
+TEST_F(SubframeNavigationFilteringThrottleTest, DelayMetrics) {
+  base::HistogramTester histogram_tester;
+  InitializeDocumentSubresourceFilter(GURL("https://example.test"));
+  CreateTestSubframeAndInitNavigation(GURL("https://example.test/allowed.html"),
+                                      main_rfh());
+
+  SimulateStartAndExpectResult(content::NavigationThrottle::PROCEED);
+  SimulateRedirectAndExpectResult(GURL("https://example.test/disallowed.html"),
+                                  content::NavigationThrottle::CANCEL);
+
+  const char kFilterDelayDisallowed[] =
+      "SubresourceFilter.DocumentLoad.SubframeFilteringDelay.Disallowed";
+  const char kFilterDelayAllowed[] =
+      "SubresourceFilter.DocumentLoad.SubframeFilteringDelay.Allowed";
+  histogram_tester.ExpectTotalCount(kFilterDelayDisallowed, 1);
+  histogram_tester.ExpectTotalCount(kFilterDelayAllowed, 0);
+
+  CreateTestSubframeAndInitNavigation(GURL("https://example.test/allowed.html"),
+                                      main_rfh());
+  SimulateStartAndExpectResult(content::NavigationThrottle::PROCEED);
+  SimulateCommitAndExpectResult(content::NavigationThrottle::PROCEED);
+  histogram_tester.ExpectTotalCount(kFilterDelayDisallowed, 1);
+  histogram_tester.ExpectTotalCount(kFilterDelayAllowed, 1);
+}
+
 }  // namespace subresource_filter