Upstream oodles of Chrome for Android code into Chromium.

chrome/browser/android/history_report/historic_visits_migration_task.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/history_report/historic_visits_migration_task.h"
+
+#include "chrome/browser/android/history_report/delta_file_commons.h"
+#include "chrome/browser/android/history_report/usage_report_util.h"
+#include "chrome/browser/android/history_report/usage_reports_buffer_service.h"
+#include "components/history/core/browser/android/android_history_types.h"
+#include "components/history/core/browser/history_backend.h"
+#include "components/history/core/browser/history_database.h"
+
+namespace {
+// The number of recent visits to fetch for a typed url.
+// Older visits are ignored.
+static const int kMaxTypedUrlVisits = 1000;
+}
+
+namespace history_report {
+
+HistoricVisitsMigrationTask::HistoricVisitsMigrationTask(
+    base::WaitableEvent* event,
+    UsageReportsBufferService* report_buffer_service)
+    : wait_event_(event), usage_reports_buffer_service_(report_buffer_service) {
+}
+
+bool HistoricVisitsMigrationTask::RunOnDBThread(
+    history::HistoryBackend* backend,
+    history::HistoryDatabase* db) {
+  history::URLRows typed_urls;
+  backend->GetAllTypedURLs(&typed_urls);
+
+  for (history::URLRows::const_iterator typed_url = typed_urls.begin();
+       typed_url != typed_urls.end();
+       ++typed_url) {
+    std::string url_id =
+        DeltaFileEntryWithData::UrlToId(typed_url->url().spec());
+    history::VisitVector url_visits;
+
+    if (usage_report_util::ShouldIgnoreUrl(typed_url->url())) {
+      continue;
+    }
+    backend->GetMostRecentVisitsForURL(
+        typed_url->id(), kMaxTypedUrlVisits, &url_visits);
+
+    for (history::VisitVector::const_iterator visit = url_visits.begin();
+         visit != url_visits.end();
+         ++visit) {
+      usage_reports_buffer_service_->AddVisit(
+          url_id,
+          visit->visit_time.ToJavaTime(),
+          usage_report_util::IsTypedVisit(visit->transition));
+    }
+  }
+  wait_event_->Signal();
+  return true;
+}
+
+}  // namespace history_report