Add infrastructure for Chrome Actions

chrome/browser/ui/toolbar/component_toolbar_actions_factory.cc

+// Copyright 2014 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/toolbar/component_toolbar_actions_factory.h"
+
+#include "base/lazy_instance.h"
+#include "chrome/browser/ui/toolbar/toolbar_action_view_controller.h"
+#include "extensions/common/feature_switch.h"
+
+namespace {
+
+ComponentToolbarActionsFactory* testing_factory_ = nullptr;
+
+base::LazyInstance<ComponentToolbarActionsFactory> lazy_factory =
+    LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+ComponentToolbarActionsFactory::ComponentToolbarActionsFactory() {}
+ComponentToolbarActionsFactory::~ComponentToolbarActionsFactory() {}
+
+// static
+ComponentToolbarActionsFactory* ComponentToolbarActionsFactory::GetInstance() {
+  return testing_factory_ ? testing_factory_ : &lazy_factory.Get();
+}
+
+ScopedVector<ToolbarActionViewController>
+ComponentToolbarActionsFactory::GetComponentToolbarActions() {
+  ScopedVector<ToolbarActionViewController> component_actions;
+
+  // This is currently behind the extension-action-redesign flag, as it is
+  // designed for the new toolbar.
+  if (!extensions::FeatureSwitch::extension_action_redesign()->IsEnabled())
+    return component_actions.Pass();
+
+  // Add component toolbar actions here.
+  // This current design means that the ComponentToolbarActionsFactory is aware
+  // of all actions. Since we should *not* have an excessive amount of these
+  // (since each will have an action in the toolbar or overflow menu), this
+  // should be okay. If this changes, we should rethink this design to have,
+  // e.g., RegisterChromeAction().
+
+  return component_actions.Pass();
+}
+
+// static
+void ComponentToolbarActionsFactory::SetTestingFactory(
+    ComponentToolbarActionsFactory* factory) {
+  testing_factory_ = factory;
+}