[Sync] Move //sync to //components/sync.

sync/js/sync_js_controller.cc

-// Copyright (c) 2012 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 "sync/js/sync_js_controller.h"
-
-#include "base/location.h"
-#include "sync/js/js_backend.h"
-#include "sync/js/js_event_details.h"
-
-namespace syncer {
-
-SyncJsController::SyncJsController() {}
-
-SyncJsController::~SyncJsController() {
-  AttachJsBackend(WeakHandle<JsBackend>());
-}
-
-void SyncJsController::AddJsEventHandler(JsEventHandler* event_handler) {
-  js_event_handlers_.AddObserver(event_handler);
-  UpdateBackendEventHandler();
-}
-
-void SyncJsController::RemoveJsEventHandler(JsEventHandler* event_handler) {
-  js_event_handlers_.RemoveObserver(event_handler);
-  UpdateBackendEventHandler();
-}
-
-void SyncJsController::AttachJsBackend(
-    const WeakHandle<JsBackend>& js_backend) {
-  js_backend_ = js_backend;
-  UpdateBackendEventHandler();
-}
-
-void SyncJsController::HandleJsEvent(const std::string& name,
-                                     const JsEventDetails& details) {
-  FOR_EACH_OBSERVER(JsEventHandler, js_event_handlers_,
-                    HandleJsEvent(name, details));
-}
-
-void SyncJsController::UpdateBackendEventHandler() {
-  if (js_backend_.IsInitialized()) {
-    // To avoid making the backend send useless events, we clear the
-    // event handler we pass to it if we don't have any event
-    // handlers.
-    WeakHandle<JsEventHandler> backend_event_handler =
-        js_event_handlers_.might_have_observers() ?
-        MakeWeakHandle(AsWeakPtr()) : WeakHandle<SyncJsController>();
-    js_backend_.Call(FROM_HERE, &JsBackend::SetJsEventHandler,
-                     backend_event_handler);
-  }
-}
-
-}  // namespace syncer