Add DelayNavigationThrottle

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index a429648555f2fe9e804f7a9c9aed318be35ce02b..7d2cc17b91054453af6ad47e375714219d24d49e 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -26,6 +26,7 @@
 #include "base/values.h"
 #include "build/build_config.h"
 #include "cc/base/switches.h"
+#include "chrome/browser/loader/delay_navigation_throttle.h"
 #include "chrome/browser/ntp_snippets/ntp_snippets_features.h"
 #include "chrome/browser/predictors/resource_prefetch_common.h"
 #include "chrome/browser/prerender/prerender_field_trial.h"
@@ -763,6 +764,20 @@ const FeatureEntry::FeatureVariation
          arraysize(kAutofillCreditCardLastUsedDateFeatureVariationExpDate),
          nullptr}};
 
+const FeatureEntry::FeatureParam kDelayNavigation5SecondDelay[] = {
+    {DelayNavigationThrottle::kParamDelayNavigationDurationMillis, "5000"},

[Charlie Harrison, 2017/03/22 18:06:44]

5s seems extreme. Is that going to be an experiment group? I think a 1s delay is
much approachable if we want people to try this out.

+    {DelayNavigationThrottle::kParamDelayNavigationProbability, "1"}};
+
+const FeatureEntry::FeatureParam kDelayNavigation5SecondDelay25Percent[] = {
+    {DelayNavigationThrottle::kParamDelayNavigationDurationMillis, "5000"},
+    {DelayNavigationThrottle::kParamDelayNavigationProbability, "0.25"}};
+
+const FeatureEntry::FeatureVariation kDelayNavigationFeatureVariations[] = {
+    {"(5 second delay, 100% probability)", kDelayNavigation5SecondDelay,
+     arraysize(kDelayNavigation5SecondDelay), nullptr},
+    {"(5 second delay, 25% probability)", kDelayNavigation5SecondDelay25Percent,
+     arraysize(kDelayNavigation5SecondDelay25Percent), nullptr}};
+
 // RECORDING USER METRICS FOR FLAGS:
 // -----------------------------------------------------------------------------
 // The first line of the entry is the internal name.
@@ -2407,6 +2422,12 @@ const FeatureEntry kFeatureEntries[] = {
      FEATURE_VALUE_TYPE(chrome::android::kUseNewDoodleApi)},
 #endif  // OS_ANDROID
 
+    {"delay-navigation", IDS_FLAGS_DELAY_NAVIGATION_NAME,
+     IDS_FLAGS_DELAY_NAVIGATION_DESCRIPTION, kOsAll,
+     FEATURE_WITH_PARAMS_VALUE_TYPE(kDelayNavigationFeature,
+                                    kDelayNavigationFeatureVariations,
+                                    "DelayNavigation")},
+
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.