arc-bridge: Introduce the ArcService class

components/arc/arc_bridge_service.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 "components/arc/arc_bridge_service.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/sequenced_task_runner.h"
@@ skipping 31 matching lines @@
 }
 
 // static
 bool ArcBridgeService::GetEnabled(const base::CommandLine* command_line) {
   return command_line->HasSwitch(chromeos::switches::kEnableArc);
 }
 
 void ArcBridgeService::AddObserver(Observer* observer) {
   DCHECK(CalledOnValidThread());
   observer_list_.AddObserver(observer);
+
+  // If any of the instances were ready before the call to AddObserver(), the
+  // |observer| won't get any readiness events. For such cases, we have to call
+  // them explicitly now to avoid a race.
+  if (app_instance())
+    observer->OnAppInstanceReady();
+  if (auth_instance())
+    observer->OnAuthInstanceReady();
+  if (clipboard_instance())
+    observer->OnClipboardInstanceReady();
+  if (ime_instance())
+    observer->OnImeInstanceReady();
+  if (input_instance())
+    observer->OnInputInstanceReady();
+  if (notifications_instance())
+    observer->OnNotificationsInstanceReady();
+  if (power_instance())
+    observer->OnPowerInstanceReady();
+  if (process_instance())
+    observer->OnProcessInstanceReady();
+  if (settings_instance())
+    observer->OnSettingsInstanceReady();
+  if (video_instance())
+    observer->OnVideoInstanceReady();
 }
 
 void ArcBridgeService::RemoveObserver(Observer* observer) {
   DCHECK(CalledOnValidThread());
   observer_list_.RemoveObserver(observer);
 }
 
 void ArcBridgeService::OnAppInstanceReady(AppInstancePtr app_ptr) {
   DCHECK(CalledOnValidThread());
   temporary_app_ptr_ = std::move(app_ptr);
@@ skipping 294 matching lines @@
   CloseInputChannel();
   CloseIntentHelperChannel();
   CloseNotificationsChannel();
   ClosePowerChannel();
   CloseProcessChannel();
   CloseSettingsChannel();
   CloseVideoChannel();
 }
 
 }  // namespace arc