[Android] Replace a synchronous callsite of GetAccounts()

chrome/browser/android/signin/account_tracker_service_android.cc

 // Copyright 2015 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/signin/account_tracker_service_android.h"
 
 #include "base/android/jni_array.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/signin/account_tracker_service_factory.h"
-#include "components/signin/core/browser/account_info.h"
+#include "components/signin/core/browser/account_tracker_service.h"
 #include "jni/AccountTrackerService_jni.h"
 
-AccountTrackerServiceAndroid::AccountTrackerServiceAndroid(JNIEnv* env,
-                                                           jobject obj) {
-  java_account_tracker_service_.Reset(env, obj);
-}
+namespace signin {
+namespace android {
 
-void AccountTrackerServiceAndroid::SeedAccountsInfo(JNIEnv* env,
-                                                    jobject obj,
-                                                    jobjectArray gaiaIds,
-                                                    jobjectArray accountNames) {
+void SeedAccountsInfo(JNIEnv* env,
+                      const JavaParamRef<jclass>& jcaller,
+                      const JavaParamRef<jobjectArray>& gaiaIds,
+                      const JavaParamRef<jobjectArray>& accountNames) {
   std::vector<std::string> gaia_ids;
   std::vector<std::string> account_names;
   base::android::AppendJavaStringArrayToStringVector(env, gaiaIds, &gaia_ids);
   base::android::AppendJavaStringArrayToStringVector(env, accountNames,
                                                      &account_names);
   DCHECK_EQ(gaia_ids.size(), account_names.size());
 
   DVLOG(1) << "AccountTrackerServiceAndroid::SeedAccountsInfo: "
            << " number of accounts " << gaia_ids.size();
   Profile* profile = ProfileManager::GetActiveUserProfile();
   AccountTrackerService* account_tracker_service_ =
       AccountTrackerServiceFactory::GetForProfile(profile);
 
-  for (unsigned int i = 0; i < gaia_ids.size(); i++) {
+  for (size_t i = 0; i < gaia_ids.size(); i++) {
     account_tracker_service_->SeedAccountInfo(gaia_ids[i], account_names[i]);

[Roger Tawa OOO till Jul 10th, 2015/10/16 17:49:02]

Remove trailing _

   }
 }
 
-static jlong Init(JNIEnv* env, const JavaParamRef<jobject>& obj) {
-  AccountTrackerServiceAndroid* account_tracker_service_android =
-      new AccountTrackerServiceAndroid(env, obj);
-  return reinterpret_cast<intptr_t>(account_tracker_service_android);
+bool RegisterAccountTrackerService(JNIEnv* env) {
+  return RegisterNativesImpl(env);
 }
 
-// static
-bool AccountTrackerServiceAndroid::Register(JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
+}  // namespace android
+}  // namespace signin