Implement native speech recognition for the launcher.

chrome/browser/ui/app_list/start_page_service.cc

Index: chrome/browser/ui/app_list/start_page_service.cc
diff --git a/chrome/browser/ui/app_list/start_page_service.cc b/chrome/browser/ui/app_list/start_page_service.cc
index b8af9bd5f3656fb6fab272a425c34731fd487bda..1d13df3ef70924183649b3995a9f1e1c72008dab 100644
--- a/chrome/browser/ui/app_list/start_page_service.cc
+++ b/chrome/browser/ui/app_list/start_page_service.cc
@@ -11,11 +11,13 @@
 #include "base/memory/singleton.h"
 #include "base/metrics/user_metrics.h"
 #include "base/prefs/pref_service.h"
+#include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/media/media_stream_infobar_delegate.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search/hotword_service.h"
 #include "chrome/browser/search/hotword_service_factory.h"
+#include "chrome/browser/ui/app_list/app_list_speech_recognizer.h"
 #include "chrome/browser/ui/app_list/recommended_apps.h"
 #include "chrome/browser/ui/app_list/start_page_observer.h"
 #include "chrome/browser/ui/app_list/start_page_service_factory.h"
@@ -136,7 +138,8 @@ void StartPageService::RemoveObserver(StartPageObserver* observer) {
 void StartPageService::AppListShown() {
   if (!contents_) {
     LoadContents();
-  } else if (contents_->GetWebUI()) {
+  } else if (contents_->GetWebUI() &&
+             !HotwordService::IsExperimentalHotwordingEnabled()) {
     // If experimental hotwording is enabled, don't enable hotwording in the
     // start page, since the hotword extension is taking care of this.
     bool hotword_enabled = HotwordEnabled() &&
@@ -154,6 +157,11 @@ void StartPageService::AppListHidden() {
   }
   if (!app_list::switches::IsExperimentalAppListEnabled())
     UnloadContents();
+
+  if (HotwordService::IsExperimentalHotwordingEnabled() &&
+      speech_recognizer_.get()) {
+    speech_recognizer_->Stop();
+  }
 }
 
 void StartPageService::ToggleSpeechRecognition() {
@@ -162,14 +170,32 @@ void StartPageService::ToggleSpeechRecognition() {
   if (!contents_->GetWebUI())
     return;
 
-  if (webui_finished_loading_) {
-    contents_->GetWebUI()->CallJavascriptFunction(
-        "appList.startPage.toggleSpeechRecognition");
-  } else {
+  if (!webui_finished_loading_) {
     pending_webui_callbacks_.push_back(
         base::Bind(&StartPageService::ToggleSpeechRecognition,
                    base::Unretained(this)));
+    return;
   }
+
+  if (HotwordService::IsExperimentalHotwordingEnabled()) {
+    if (!speech_recognizer_.get()) {
+      std::string profile_locale;
+#if defined(OS_CHROMEOS)
+      profile_locale = profile_->GetPrefs()->GetString(
+          prefs::kApplicationLocale);
+#endif
+      if (profile_locale.empty())
+        profile_locale = g_browser_process->GetApplicationLocale();
+
+      speech_recognizer_ = new AppListSpeechRecognizer(this, profile_locale);
+    }
+
+    speech_recognizer_->Start();
+    return;
+  }
+
+  contents_->GetWebUI()->CallJavascriptFunction(
+      "appList.startPage.toggleSpeechRecognition");
 }
 
 bool StartPageService::HotwordEnabled() {
@@ -218,6 +244,13 @@ void StartPageService::OnSpeechSoundLevelChanged(int16 level) {
 
 void StartPageService::OnSpeechRecognitionStateChanged(
     SpeechRecognitionState new_state) {
+
+  if (HotwordService::IsExperimentalHotwordingEnabled() &&
+      new_state == SPEECH_RECOGNITION_READY &&
+      speech_recognizer_.get()) {
+    speech_recognizer_->Stop();
+  }
+
   if (!InSpeechRecognition(state_) && InSpeechRecognition(new_state)) {
     if (!speech_button_toggled_manually_ &&
         state_ == SPEECH_RECOGNITION_HOTWORD_LISTENING) {