Add DelayNavigationThrottle

chrome/browser/about_flags.cc

 // Copyright (c) 2012 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 "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/feature_list.h"
 #include "base/i18n/base_i18n_switches.h"
 #include "base/macros.h"
 #include "base/memory/singleton.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/metrics_hashes.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/task_scheduler/switches.h"
 #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"
 #include "chrome/common/channel_info.h"
 #include "chrome/common/chrome_content_client.h"
 #include "chrome/common/chrome_features.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/features.h"
 #include "chrome/grit/chromium_strings.h"
 #include "chrome/grit/generated_resources.h"
@@ skipping 717 matching lines @@
     kAutofillCreditCardLastUsedDateFeatureVariationExpDate[] = {
         {"show_expiration_date", "true"}};
 
 const FeatureEntry::FeatureVariation
     kAutofillCreditCardLastUsedDateFeatureVariations[] = {
         {"Display expiration date",
          kAutofillCreditCardLastUsedDateFeatureVariationExpDate,
          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.
 //
 // To add a new entry, add to the end of kFeatureEntries. There are two
 // distinct types of entries:
 // . SINGLE_VALUE: entry is either on or off. Use the SINGLE_VALUE_TYPE
 //   macro for this type supplying the command line to the macro.
 // . MULTI_VALUE: a list of choices, the first of which should correspond to a
 //   deactivated state for this lab (i.e. no command line option).  To specify
@@ skipping 1624 matching lines @@
      IDS_FLAGS_FORCE_TABLET_MODE_DESCRIPTION, kOsCrOS,
      MULTI_VALUE_TYPE(kForceTabletModeChoices)},
 #endif  // OS_CHROMEOS
 
 #if defined(OS_ANDROID)
     {"use-new-doodle-api", IDS_FLAGS_USE_NEW_DOODLE_API_NAME,
      IDS_FLAGS_USE_NEW_DOODLE_API_DESCRIPTION, kOsAndroid,
      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.
 };
 
 class FlagsStateSingleton {
  public:
   FlagsStateSingleton()
       : flags_state_(kFeatureEntries, arraysize(kFeatureEntries)) {}
   ~FlagsStateSingleton() {}
@@ skipping 188 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags