Index: components/ntp_tiles/field_trial.cc |
diff --git a/components/ntp_tiles/field_trial.cc b/components/ntp_tiles/field_trial.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..39f4b7252ea18f0656bac20126e33b999d796560 |
--- /dev/null |
+++ b/components/ntp_tiles/field_trial.cc |
@@ -0,0 +1,96 @@ |
+// Copyright 2016 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 "base/metrics/field_trial.h" |
+ |
+#if defined(OS_ANDROID) |
+#include <jni.h> |
+#endif |
+ |
+#include "base/command_line.h" |
+#include "base/metrics/field_trial.h" |
+#include "base/strings/string_util.h" |
+#include "components/ntp_tiles/constants.h" |
+#include "components/ntp_tiles/field_trial.h" |
+#include "components/ntp_tiles/switches.h" |
+ |
+#if defined(OS_ANDROID) |
+#include "base/android/jni_android.h" |
+#include "jni/MostVisitedSites_jni.h" |
+#endif |
+ |
+namespace { |
+const char kPopularSiteDefaultGroup[] = "Default"; |
+const char kPopularSiteControlGroup[] = "Control"; |
+const char kPopularSiteEnabledGroup[] = "Enabled"; |
+const char kPopularSiteEnabledCommandLineSwitchGroup[] = |
+ "EnabledWithCommandLineSwitch"; |
+const char kPopularSiteDisabledCommandLineSwitchGroup[] = |
+ "DisabledWithCommandLineSwitch"; |
+} // namespace |
+ |
+namespace ntp_tiles { |
+ |
+// On iOS it is not technically possible to prep the field trials on first |
+// launch, the configuration file is downloaded too late. In order to run some |
+// experiments that need to be active on first launch to be meaningful these |
+// are hardcoded, but can be superceeded by a server side config on subsequent |
+// launches. |
+void SetUpFirstLaunchFieldTrial(bool is_stable_channel) { |
+ // Check first if a server side config superceeded this experiment. |
+ if (base::FieldTrialList::TrialExists(kPopularSitesFieldTrialName)) |
+ return; |
+ |
+ // Stable channels will run with 10% probability. |
+ // Non-stable channels will run with 50% probability. |
+ const base::FieldTrial::Probability kTotalProbability = 100; |
+ const base::FieldTrial::Probability kEnabledAndControlProbability = |
+ is_stable_channel ? 10 : 50; |
+ |
+ // Experiment enabled until March 15, 2017. By default, disabled. |
+ scoped_refptr<base::FieldTrial> trial( |
+ base::FieldTrialList::FactoryGetFieldTrial( |
+ kPopularSitesFieldTrialName, kTotalProbability, |
+ kPopularSiteDefaultGroup, 2017, 3, 15, // Mar 15, 2017 |
+ base::FieldTrial::ONE_TIME_RANDOMIZED, nullptr)); |
+ |
+ base::CommandLine* command_line = base::CommandLine::ForCurrentProcess(); |
+ if (command_line->HasSwitch(ntp_tiles::switches::kEnableNTPPopularSites)) { |
+ trial->AppendGroup(kPopularSiteEnabledCommandLineSwitchGroup, |
+ kTotalProbability); |
+ } else if (command_line->HasSwitch( |
+ ntp_tiles::switches::kDisableNTPPopularSites)) { |
+ trial->AppendGroup(kPopularSiteDisabledCommandLineSwitchGroup, |
+ kTotalProbability); |
+ } else { |
+ trial->AppendGroup(kPopularSiteControlGroup, kEnabledAndControlProbability); |
+ trial->AppendGroup(kPopularSiteEnabledGroup, kEnabledAndControlProbability); |
+ } |
+} |
+ |
+bool ShouldShowPopularSites() { |
+ // Note: It's important to query the field trial state first, to ensure that |
+ // UMA reports the correct group. |
+ const std::string group_name = |
+ base::FieldTrialList::FindFullName(kPopularSitesFieldTrialName); |
+ |
+ base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess(); |
+ if (cmd_line->HasSwitch(switches::kDisableNTPPopularSites)) |
+ return false; |
+ |
+ if (cmd_line->HasSwitch(switches::kEnableNTPPopularSites)) |
+ return true; |
+ |
+#if defined(OS_ANDROID) |
+ if (Java_MostVisitedSites_isPopularSitesForceEnabled( |
+ base::android::AttachCurrentThread())) { |
+ return true; |
+ } |
+#endif |
+ |
+ return base::StartsWith(group_name, "Enabled", |
+ base::CompareCase::INSENSITIVE_ASCII); |
+} |
+ |
+} // namespace ntp_tiles |