Add chrome.searchEnginesPrivate API and Search Settings page.

chrome/browser/extensions/api/search_engines_private/search_engines_private_event_router.h

Index: chrome/browser/extensions/api/search_engines_private/search_engines_private_event_router.h
diff --git a/chrome/browser/extensions/api/search_engines_private/search_engines_private_event_router.h b/chrome/browser/extensions/api/search_engines_private/search_engines_private_event_router.h
new file mode 100644
index 0000000000000000000000000000000000000000..af62d2219b0caa9c34a4664617591e4abfcecf33
--- /dev/null
+++ b/chrome/browser/extensions/api/search_engines_private/search_engines_private_event_router.h
@@ -0,0 +1,62 @@
+// 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_API_SEARCH_ENGINES_PRIVATE_SEARCH_ENGINES_PRIVATE_EVENT_ROUTER_H_
+#define CHROME_BROWSER_EXTENSIONS_API_SEARCH_ENGINES_PRIVATE_SEARCH_ENGINES_PRIVATE_EVENT_ROUTER_H_
+
+#include "components/keyed_service/core/keyed_service.h"
+#include "components/search_engines/template_url_service.h"
+#include "components/search_engines/template_url_service_observer.h"
+#include "extensions/browser/event_router.h"
+
+namespace content {
+class BrowserContext;
+}
+
+namespace extensions {
+
+class SearchEnginesPrivateDelegate;
+
+// This is an event router that will observe changes to the available and
+// selected search engines via the TemplateURLService, and notify listeners to
+// events on the searchEnginesPrivate API of changes.
+class SearchEnginesPrivateEventRouter : public KeyedService,
+                                        public EventRouter::Observer,
+                                        public TemplateURLServiceObserver {
+ public:
+  static SearchEnginesPrivateEventRouter* Create(
+      content::BrowserContext* browser_context);
+  ~SearchEnginesPrivateEventRouter() override;
+
+  // TemplateURLServiceObserver implementation.
+  void OnTemplateURLServiceChanged() override;
+
+ protected:
+  explicit SearchEnginesPrivateEventRouter(content::BrowserContext* context);
+
+  // KeyedService overrides:
+  void Shutdown() override;
+
+  // EventRouter::Observer overrides:
+  void OnListenerAdded(const EventListenerInfo& details) override;
+  void OnListenerRemoved(const EventListenerInfo& details) override;
+
+  TemplateURLService* template_url_service_;
+
+ private:
+  // Decide if we should listen for search engines changes or not. If there are
+  // any JavaScript listeners registered for the onDefaultSearchEnginesChanged
+  // event, then we want to register for change notifications.
+  // Otherwise, we want to unregister and not be listening for changes.
+  void StartOrStopListeningForSearchEnginesChanges();
+
+  content::BrowserContext* context_;
+  bool listening_;
+
+  DISALLOW_COPY_AND_ASSIGN(SearchEnginesPrivateEventRouter);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_SEARCH_ENGINES_PRIVATE_SEARCH_ENGINES_PRIVATE_EVENT_ROUTER_H_