Adds HotwordPrivate API for integrating the hotword feature to AppLauncher

chrome/browser/ui/app_list/app_list_view_delegate.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 "chrome/browser/ui/app_list/app_list_view_delegate.h"
 
 #include <vector>
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/metrics/user_metrics.h"
 #include "base/stl_util.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/feedback/feedback_util.h"
 #include "chrome/browser/profiles/profile_info_cache.h"
 #include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/search/hotword_service.h"
+#include "chrome/browser/search/hotword_service_factory.h"
 #include "chrome/browser/ui/app_list/app_list_controller_delegate.h"
 #include "chrome/browser/ui/app_list/app_list_service.h"
 #include "chrome/browser/ui/app_list/app_list_syncable_service.h"
 #include "chrome/browser/ui/app_list/app_list_syncable_service_factory.h"
 #include "chrome/browser/ui/app_list/search/search_controller.h"
 #include "chrome/browser/ui/app_list/start_page_service.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/chrome_pages.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/scoped_tabbed_browser_displayer.h"
@@ skipping 107 matching lines @@
       profile_manager()->GetProfileInfoCache().RemoveObserver(this);
 
   SigninManagerFactory* factory = SigninManagerFactory::GetInstance();
   if (factory)
     factory->RemoveObserver(this);
 
   // Ensure search controller is released prior to speech_ui_.
   search_controller_.reset();
 }
 
+void AppListViewDelegate::OnHotwordStateChanged(bool enabled) {
+  if (enabled) {
+    if (speech_ui_->state() == app_list::SPEECH_RECOGNITION_READY) {
+      OnSpeechRecognitionStateChanged(
+          app_list::SPEECH_RECOGNITION_HOTWORD_LISTENING);
+    }
+  } else {
+    if (speech_ui_->state() == app_list::SPEECH_RECOGNITION_HOTWORD_LISTENING)

[rpetterson, 2014/05/05 19:43:36]

I'm confused by what the "enabled" parameter is referring to. Does it refer to
whether hotwording is enabled? However, you pass "params->started" to the call
in hotword_private_api.cc. How are started and enabled related?

[Jun Mukai, 2014/05/05 20:00:55]

good catch. changed to use 'started' everywhere

+      OnSpeechRecognitionStateChanged(app_list::SPEECH_RECOGNITION_READY);
+  }
+}
+
+void AppListViewDelegate::OnHotwordRecognized() {
+  DCHECK_EQ(app_list::SPEECH_RECOGNITION_HOTWORD_LISTENING,
+            speech_ui_->state());
+  ToggleSpeechRecognition();
+}
+
 void AppListViewDelegate::SigninManagerCreated(SigninManagerBase* manager) {
   scoped_observer_.Add(manager);
 }
 
 void AppListViewDelegate::SigninManagerShutdown(SigninManagerBase* manager) {
   if (scoped_observer_.IsObserving(manager))
     scoped_observer_.Remove(manager);
 }
 
 void AppListViewDelegate::GoogleSigninFailed(
@@ skipping 127 matching lines @@
 }
 
 void AppListViewDelegate::AutoLaunchCanceled() {
   base::RecordAction(base::UserMetricsAction("AppList_AutoLaunchCanceled"));
   auto_launch_timeout_ = base::TimeDelta();
 }
 
 void AppListViewDelegate::ViewInitialized() {
   app_list::StartPageService* service =
       app_list::StartPageService::Get(profile_);
-  if (service)
+  if (service) {
     service->AppListShown();
+    if (service->HotwordEnabled()) {
+      HotwordService* hotword_service =
+          HotwordServiceFactory::GetForProfile(profile_);
+      if (hotword_service)
+        hotword_service->RequestHotwordSession(this);
+    }
+  }
 }
 
 void AppListViewDelegate::Dismiss()  {
   controller_->DismissView();
 }
 
 void AppListViewDelegate::ViewClosing() {
   controller_->ViewClosing();
 
   app_list::StartPageService* service =
       app_list::StartPageService::Get(profile_);
-  if (service)
+  if (service) {
     service->AppListHidden();
+    if (service->HotwordEnabled()) {
+      HotwordService* hotword_service =
+          HotwordServiceFactory::GetForProfile(profile_);
+      if (hotword_service)
+        hotword_service->StopHotwordSession(this);
+    }
+  }
 }
 
 gfx::ImageSkia AppListViewDelegate::GetWindowIcon() {
   return controller_->GetWindowIcon();
 }
 
 void AppListViewDelegate::OpenSettings() {
   ExtensionService* service = profile_->GetExtensionService();
   DCHECK(service);
   const extensions::Extension* extension = service->GetInstalledExtension(
@@ skipping 96 matching lines @@
 
 void AppListViewDelegate::AddObserver(
     app_list::AppListViewDelegateObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void AppListViewDelegate::RemoveObserver(
     app_list::AppListViewDelegateObserver* observer) {
   observers_.RemoveObserver(observer);
 }