Explicitly reset the speech state when closing the app launcher.

chrome/browser/ui/app_list/start_page_service.cc

 // Copyright 2013 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/start_page_service.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 323 matching lines @@
     contents_->GetWebUI()->CallJavascriptFunction(
         "appList.startPage.onAppListHidden");
   }
   if (!app_list::switches::IsExperimentalAppListEnabled())
     UnloadContents();
 
   if (HotwordService::IsExperimentalHotwordingEnabled() &&
       speech_recognizer_) {
     speech_recognizer_->Stop();
     speech_recognizer_.reset();
+
+    // When the SpeechRecognizer is destroyed above, we get stuck in the current
+    // speech state instead of being reset into the READY state. Reset the
+    // speech state explicitly so that speech works when the launcher is opened
+    // again.
+    OnSpeechRecognitionStateChanged(SPEECH_RECOGNITION_READY);
   }
 
 #if defined(OS_CHROMEOS)
   audio_status_.reset();
 #endif
 }
 
 void StartPageService::ToggleSpeechRecognition(
     const scoped_refptr<content::SpeechRecognitionSessionPreamble>& preamble) {
   DCHECK(contents_);
@@ skipping 255 matching lines @@
 
   // Check for a new doodle.
   content::BrowserThread::PostDelayedTask(
       content::BrowserThread::UI, FROM_HERE,
       base::Bind(&StartPageService::FetchDoodleJson,
                  weak_factory_.GetWeakPtr()),
       recheck_delay);
 }
 
 }  // namespace app_list