[Video Tutorials] Prefs.

- Add Keys for preferred language and last updated time.
- Register to PrefService.

Change-Id: I844b4897ade5478603e386c9b4d615ed53b3c03d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2394518Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809137}

chrome/browser/prefs/browser_prefs.cc

@@ -222,6 +222,7 @@
 #include "chrome/browser/first_run/android/first_run_prefs.h"
 #include "chrome/browser/media/android/cdm/media_drm_origin_id_manager.h"
 #include "chrome/browser/ssl/known_interception_disclosure_infobar_delegate.h"
+#include "chrome/browser/video_tutorials/prefs.h"
 #include "components/cdm/browser/media_drm_storage_impl.h"  // nogncheck crbug.com/1125897
 #include "components/feed/buildflags.h"
 #include "components/feed/core/shared_prefs/pref_names.h"
@@ -622,7 +623,7 @@ void RegisterLocalState(PrefRegistrySimple* registry) {
   ::android::RegisterPrefs(registry);
 
   registry->RegisterBooleanPref(first_run::kCCTToSDialogEnabled, true);
-#else   // defined(OS_ANDROID)
+#else  // defined(OS_ANDROID)
   enterprise_connectors::RegisterLocalStatePrefs(registry);
   enterprise_reporting::RegisterLocalStatePrefs(registry);
   gcm::RegisterPrefs(registry);
@@ -880,6 +881,7 @@ void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry,
   RecentTabsPagePrefs::RegisterProfilePrefs(registry);
   usage_stats::UsageStatsBridge::RegisterProfilePrefs(registry);
   variations::VariationsService::RegisterProfilePrefs(registry);
+  video_tutorials::RegisterPrefs(registry);
   feed::prefs::RegisterFeedSharedProfilePrefs(registry);
 #if BUILDFLAG(ENABLE_FEED_IN_CHROME)
   feed::RegisterProfilePrefs(registry);

chrome/browser/video_tutorials/BUILD.gn

@@ -19,6 +19,8 @@ group("video_tutorials") {
 
 source_set("public") {
   sources = [
+    "prefs.cc",
+    "prefs.h",
     "switches.cc",
     "switches.h",
     "tutorial.cc",
@@ -31,6 +33,7 @@ source_set("public") {
   public_deps = [
     "//base",
     "//components/keyed_service/core",
+    "//components/prefs",
     "//url:url",
   ]
 }

chrome/browser/video_tutorials/prefs.cc

+// Copyright 2020 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/video_tutorials/prefs.h"
+
+#include "components/prefs/pref_registry_simple.h"
+#include "components/prefs/pref_service.h"
+
+namespace video_tutorials {
+
+constexpr char kPreferredLanguageKey[] = "video_tutorials.perferred_language";
+
+constexpr char kLastUpdatedTimeKey[] = "video_tutorials.last_updated_time";
+
+void RegisterPrefs(PrefRegistrySimple* registry) {
+  registry->RegisterStringPref(kPreferredLanguageKey, std::string());
+  registry->RegisterTimePref(kLastUpdatedTimeKey, base::Time());
+}
+
+}  // namespace video_tutorials

chrome/browser/video_tutorials/prefs.h

+// Copyright 2020 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.
+
+#ifndef CHROME_BROWSER_VIDEO_TUTORIALS_PREFS_H_
+#define CHROME_BROWSER_VIDEO_TUTORIALS_PREFS_H_
+
+#include <string>
+#include "base/optional.h"
+#include "base/time/time.h"
+
+class PrefRegistrySimple;
+
+namespace video_tutorials {
+
+// Key for the language that user picked in video tutorials service.
+extern const char kPreferredLanguageKey[];
+
+// Key to record a timestamp when the last update of video tutorials metadata
+// happened.
+extern const char kLastUpdatedTimeKey[];
+
+// Register to prefs service.
+void RegisterPrefs(PrefRegistrySimple* registry);
+
+}  // namespace video_tutorials
+
+#endif  // CHROME_BROWSER_VIDEO_TUTORIALS_PREFS_H_