Adding in memory log of history visit database. This...

chrome/browser/history/visit_log.cc

+// Copyright (c) 2009 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/history/visit_log.h"
+
+namespace history {
+
+static VisitLog* g_visit_log = NULL;
+
+VisitLog::VisitLog()
+    : index_(0),
+      num_add_(0),
+      num_delete_(0),
+      num_update_(0),
+      num_select_(0) {
+  memset(events_, NO_OP, sizeof(events_));
+}
+
+VisitLog::~VisitLog() {
+}
+
+void VisitLog::AddEvent(EventType event) {
+  switch (event) {
+    case ADD_VISIT:
+      num_add_++;
+      break;
+    case DELETE_VISIT:
+      num_delete_++;
+      break;
+    case UPDATE_VISIT:
+      num_update_++;
+      break;
+    case SELECT_VISIT:
+      num_select_++;
+      break;
+    default:
+      return;
+  }
+
+  events_[index_++] = event;
+  if (index_ == kVisitLogBufferSize)
+    index_ = 0;
+}
+
+void InitVisitLog(VisitLog* vlog) {
+  g_visit_log = vlog;
+}
+
+void AddEventToVisitLog(VisitLog::EventType event) {
+  if (!g_visit_log)
+    return;
+  g_visit_log->AddEvent(event);
+}
+
+}  // namespace history