Variations seed is pulled from the Java application on the first launch of Chrome

chrome/browser/android/preferences/pref_service_bridge.cc

 // Copyright 2014 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/android/preferences/pref_service_bridge.h"
 
 #include <jni.h>
+#include <vector>

[Alexei Svitkine (slow), 2015/11/04 16:47:23]

Is this needed anymore?

 
 #include "base/android/build_info.h"
 #include "base/android/jni_android.h"
+#include "base/android/jni_array.h"

[Alexei Svitkine (slow), 2015/11/04 16:47:23]

Is this needed anymore?

 #include "base/android/jni_string.h"
 #include "base/android/jni_weak_ref.h"
+#include "base/base64.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
+#include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browsing_data/browsing_data_helper.h"
 #include "chrome/browser/browsing_data/browsing_data_remover.h"
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
 #include "chrome/browser/net/prediction_options.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/translate/chrome_translate_client.h"
 #include "chrome/browser/ui/android/android_about_app_info.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/locale_settings.h"
 #include "components/content_settings/core/browser/host_content_settings_map.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
 #include "components/content_settings/core/common/pref_names.h"
 #include "components/metrics/metrics_pref_names.h"
 #include "components/password_manager/core/common/password_manager_pref_names.h"
 #include "components/signin/core/common/signin_pref_names.h"
 #include "components/translate/core/browser/translate_prefs.h"
 #include "components/translate/core/common/translate_pref_names.h"
+#include "components/variations/pref_names.h"
 #include "components/version_info/version_info.h"
 #include "components/web_resource/web_resource_pref_names.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/user_metrics.h"
 #include "jni/PrefServiceBridge_jni.h"
 #include "ui/base/l10n/l10n_util.h"
 
 using base::android::AttachCurrentThread;
 using base::android::CheckException;
 using base::android::ConvertJavaStringToUTF8;
 using base::android::ConvertUTF8ToJavaString;
+using base::android::GetApplicationContext;
 using base::android::ScopedJavaLocalRef;
 using base::android::ScopedJavaGlobalRef;
 using content::BrowserThread;
 
 namespace {
 
 enum NetworkPredictionOptions {
   NETWORK_PREDICTION_ALWAYS,
   NETWORK_PREDICTION_WIFI_ONLY,
   NETWORK_PREDICTION_NEVER,
@@ skipping 881 matching lines @@
     ContentSettingsType content_type) {
   JNIEnv* env = AttachCurrentThread();
   base::android::ScopedJavaLocalRef<jstring> android_permission =
       Java_PrefServiceBridge_getAndroidPermissionForContentSetting(
           env, content_type);
   if (android_permission.is_null())
     return std::string();
 
   return ConvertJavaStringToUTF8(android_permission);
 }
+
+// static
+void PrefServiceBridge::GetVariationsFirstRunSeed(std::string* seed_data,
+                                                  std::string* seed_signature,
+                                                  std::string* seed_country) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jstring> j_seed_data =
+      Java_PrefServiceBridge_getVariationsFirstRunSeedData(

[Alexei Svitkine (slow), 2015/11/04 16:47:23]

Nit: Now that you're returning base64, please name things accordingly.

getVariationsFirstRunSeedDataBase64(), j_seed_data_base64, etc.

+          env, GetApplicationContext());
+  ScopedJavaLocalRef<jstring> j_seed_signature =
+      Java_PrefServiceBridge_getVariationsFirstRunSeedSignature(
+          env, GetApplicationContext());
+  ScopedJavaLocalRef<jstring> j_seed_country =
+      Java_PrefServiceBridge_getVariationsFirstRunSeedCountry(
+          env, GetApplicationContext());
+  // deserialize raw seed data.

[Alexei Svitkine (slow), 2015/11/04 16:47:23]

Nit: Capitalize

+  base::Base64Decode(ConvertJavaStringToUTF8(j_seed_data), seed_data);

[Alexei Svitkine (slow), 2015/11/04 16:47:23]

Nit: This API could potentially fail. I think it should be something like:

if (!base::Base64Decode(ConvertJavaStringToUTF8(j_seed_data), seed_data))
  seed_data->clear();

+  *seed_signature = ConvertJavaStringToUTF8(j_seed_signature);
+  *seed_country = ConvertJavaStringToUTF8(j_seed_country);
+}