[Sync] Merge //components/browser_sync into one directory.

components/browser_sync/browser/signin_confirmation_helper.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 "components/browser_sync/browser/signin_confirmation_helper.h"
-
-#include "base/strings/string16.h"
-#include "base/threading/thread_task_runner_handle.h"
-#include "components/history/core/browser/history_backend.h"
-#include "components/history/core/browser/history_db_task.h"
-#include "components/history/core/browser/history_service.h"
-#include "components/history/core/browser/history_types.h"
-
-namespace {
-
-// Determines whether there are any typed URLs in a history backend.
-class HasTypedURLsTask : public history::HistoryDBTask {
- public:
-  explicit HasTypedURLsTask(const base::Callback<void(bool)>& cb)
-      : has_typed_urls_(false), cb_(cb) {}
-
-  bool RunOnDBThread(history::HistoryBackend* backend,
-                     history::HistoryDatabase* db) override {
-    history::URLRows rows;
-    backend->GetAllTypedURLs(&rows);
-    if (!rows.empty()) {
-      DVLOG(1) << "SigninConfirmationHelper: history contains " << rows.size()
-               << " typed URLs";
-      has_typed_urls_ = true;
-    }
-    return true;
-  }
-
-  void DoneRunOnMainThread() override { cb_.Run(has_typed_urls_); }
-
- private:
-  ~HasTypedURLsTask() override {}
-
-  bool has_typed_urls_;
-  base::Callback<void(bool)> cb_;
-};
-
-}  // namespace
-
-namespace sync_driver {
-
-SigninConfirmationHelper::SigninConfirmationHelper(
-    history::HistoryService* history_service,
-    const base::Callback<void(bool)>& return_result)
-    : origin_thread_(base::ThreadTaskRunnerHandle::Get()),
-      history_service_(history_service),
-      pending_requests_(0),
-      return_result_(return_result) {}
-
-SigninConfirmationHelper::~SigninConfirmationHelper() {
-  DCHECK(origin_thread_->BelongsToCurrentThread());
-}
-
-void SigninConfirmationHelper::OnHistoryQueryResults(
-    size_t max_entries,
-    history::QueryResults* results) {
-  history::QueryResults owned_results;
-  results->Swap(&owned_results);
-  bool too_much_history = owned_results.size() >= max_entries;
-  if (too_much_history) {
-    DVLOG(1) << "SigninConfirmationHelper: profile contains "
-             << owned_results.size() << " history entries";
-  }
-  ReturnResult(too_much_history);
-}
-
-void SigninConfirmationHelper::CheckHasHistory(int max_entries) {
-  pending_requests_++;
-  if (!history_service_) {
-    PostResult(false);
-    return;
-  }
-  history::QueryOptions opts;
-  opts.max_count = max_entries;
-  history_service_->QueryHistory(
-      base::string16(), opts,
-      base::Bind(&SigninConfirmationHelper::OnHistoryQueryResults,
-                 base::Unretained(this), max_entries),
-      &task_tracker_);
-}
-
-void SigninConfirmationHelper::CheckHasTypedURLs() {
-  pending_requests_++;
-  if (!history_service_) {
-    PostResult(false);
-    return;
-  }
-  history_service_->ScheduleDBTask(
-      std::unique_ptr<history::HistoryDBTask>(new HasTypedURLsTask(base::Bind(
-          &SigninConfirmationHelper::ReturnResult, base::Unretained(this)))),
-      &task_tracker_);
-}
-
-void SigninConfirmationHelper::PostResult(bool result) {
-  origin_thread_->PostTask(FROM_HERE,
-                           base::Bind(&SigninConfirmationHelper::ReturnResult,
-                                      base::Unretained(this), result));
-}
-
-void SigninConfirmationHelper::ReturnResult(bool result) {
-  DCHECK(origin_thread_->BelongsToCurrentThread());
-  // Pass |true| into the callback as soon as one of the tasks passes a
-  // result of |true|, otherwise pass the last returned result.
-  if (--pending_requests_ == 0 || result) {
-    return_result_.Run(result);
-
-    // This leaks at shutdown if the HistoryService is destroyed, but
-    // the process is going to die anyway.
-    delete this;
-  }
-}
-
-}  // namespace sync_driver