arc-app-launcher: Minimal support for ARC app launcher.

chrome/browser/ui/app_list/app_list_model_builder.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/ui/app_list/app_list_model_builder.h"
+
+#include "chrome/browser/ui/app_list/app_list_syncable_service.h"
+#include "ui/app_list/app_list_item.h"
+#include "ui/app_list/app_list_model.h"
+
+AppListModelBuilder::AppListModelBuilder(AppListControllerDelegate* controller,
+                                         const char* item_type)
+    : controller_(controller),
+      item_type_(item_type) {
+}
+
+AppListModelBuilder::~AppListModelBuilder() {
+  if (!service_) {

[jochen (gone - plz use gerrit), 2015/12/03 10:25:39]

no {} for single line body

[khmel1, 2015/12/03 12:34:49]

Done.

+    model_->top_level_item_list()->RemoveObserver(this);
+  }
+}
+
+void AppListModelBuilder::InitializeWithService(
+    app_list::AppListSyncableService* service,
+    app_list::AppListModel* model) {
+  DCHECK(!service_ && !profile_);
+  model_ = model;
+  service_ = service;
+  profile_ = service->profile();
+
+  BuildModel();
+}
+
+void AppListModelBuilder::InitializeWithProfile(Profile* profile,
+                                                app_list::AppListModel* model) {
+  DCHECK(!service_ && !profile_);
+  model_ = model;
+  model_->top_level_item_list()->AddObserver(this);
+  profile_ = profile;
+
+  BuildModel();
+}
+
+void AppListModelBuilder::InsertApp(scoped_ptr<app_list::AppListItem> app) {
+  if (service_) {
+    service_->AddItem(app.Pass());
+    return;
+  }
+  model_->AddItem(app.Pass());
+}
+
+const app_list::AppListSyncableService::SyncItem*
+    AppListModelBuilder::GetSyncItem(const std::string& id) {
+  return service_ ? service_->GetSyncItem(id) : nullptr;
+}
+
+app_list::AppListItem* AppListModelBuilder::GetAppItem(const std::string& id) {
+  app_list::AppListItem* item = model_->FindItem(id);
+  LOG_IF(ERROR, item && item->GetItemType() != item_type_)

[jochen (gone - plz use gerrit), 2015/12/03 10:25:39]

VLOG() or DVLOG().

why are we returning the item if it's wrong?

[khmel1, 2015/12/03 12:34:49]

Good point. Return nullptr in this case

+      << "App Item matching id: " << id
+      << " has incorrect type: '" << item->GetItemType() << "'";
+  return item;
+}