Adding performance tests for HQP that represent importance of optimising HistoryItemsForTerms method

components/omnibox/browser/fake_autocomplete_provider_client.cc

+// Copyright 2016 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/omnibox/browser/fake_autocomplete_provider_client.h"
+
+#include "base/memory/ptr_util.h"
+#include "components/bookmarks/browser/bookmark_model.h"
+#include "components/bookmarks/test/test_bookmark_client.h"
+#include "components/history/core/browser/history_service.h"
+#include "components/history/core/test/history_service_test_util.h"
+#include "components/omnibox/browser/in_memory_url_index.h"
+#include "components/omnibox/browser/in_memory_url_index_test_util.h"
+
+namespace {
+
+// Arbitrary number > 1 so that tasks don't run sequentially.
+constexpr int kWorkerThreadCount = 3;
+
+}  // namespace
+
+FakeAutocompleteProviderClient::FakeAutocompleteProviderClient()
+    : pool_owner_(kWorkerThreadCount, "Background Pool") {
+  bookmark_model_ = bookmarks::TestBookmarkClient::CreateModel();
+
+  CHECK(history_dir_.CreateUniqueTempDir());
+  history_service_ =
+      history::CreateHistoryService(history_dir_.GetPath(), true);
+
+  in_memory_url_index_.reset(new InMemoryURLIndex(
+      bookmark_model_.get(), history_service_.get(), nullptr,
+      pool_owner_.pool().get(), history_dir_.GetPath(), SchemeSet()));
+  in_memory_url_index_->Init();
+}
+
+FakeAutocompleteProviderClient::~FakeAutocompleteProviderClient() = default;
+
+const AutocompleteSchemeClassifier&
+FakeAutocompleteProviderClient::GetSchemeClassifier() const {
+  return scheme_classifier_;
+}
+
+const SearchTermsData& FakeAutocompleteProviderClient::GetSearchTermsData()
+    const {
+  return search_terms_data_;
+}
+
+history::HistoryService* FakeAutocompleteProviderClient::GetHistoryService() {
+  return history_service_.get();
+}
+
+bookmarks::BookmarkModel* FakeAutocompleteProviderClient::GetBookmarkModel() {
+  return bookmark_model_.get();
+}
+
+InMemoryURLIndex* FakeAutocompleteProviderClient::GetInMemoryURLIndex() {
+  return in_memory_url_index_.get();
+}