Make availability of hotword hardware known to hotword component extension.

chrome/browser/search/hotword_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/search/hotword_service.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/i18n/case_conversion.h"
@@ skipping 32 matching lines @@
 #include "content/public/common/webplugininfo.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/uninstall_reason.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/one_shot_event.h"
 #include "grit/theme_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 
+#if defined(OS_CHROMEOS)
+#include "chromeos/audio/cras_audio_handler.h"
+#endif
+
 using extensions::BrowserContextKeyedAPIFactory;
 using extensions::HotwordPrivateEventService;
 
 namespace {
 
 // Allowed locales for hotwording. Note that Chrome does not support all of
 // these locales, condensing them to their 2-letter equivalent, but the full
 // list is here for completeness and testing.
 static const char* kSupportedLocales[] = {
   "en",
@@ skipping 229 matching lines @@
   }
   return false;
 }
 
 // static
 bool HotwordService::IsExperimentalHotwordingEnabled() {
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   return !command_line->HasSwitch(switches::kDisableExperimentalHotwording);
 }
 
+// static
+bool HotwordService::IsHotwordHardwareAvailable() {
+#if defined(OS_CHROMEOS)
+  if (chromeos::CrasAudioHandler::IsInitialized()) {
+    chromeos::AudioDeviceList devices;
+    chromeos::CrasAudioHandler::Get()->GetAudioDevices(&devices);
+    for (size_t i = 0; i < devices.size(); ++i) {
+      if (devices[i].type == chromeos::AUDIO_TYPE_AOKR) {
+        DCHECK(devices[i].is_input);
+        return true;
+      }
+    }
+  }
+#endif
+  return false;
+}
+
 #if defined(OS_CHROMEOS)
 class HotwordService::HotwordUserSessionStateObserver
     : public user_manager::UserManager::UserSessionStateObserver {
  public:
   explicit HotwordUserSessionStateObserver(HotwordService* service)
       : service_(service) {}
 
   // Overridden from UserSessionStateObserver:
   void ActiveUserChanged(const user_manager::User* active_user) override {
     service_->ActiveUserChanged();
@@ skipping 576 matching lines @@
   // Only support multiple profiles and profile switching in ChromeOS.
   if (user_manager::UserManager::IsInitialized()) {
     user_manager::User* user =
         user_manager::UserManager::Get()->GetActiveUser();
     if (user && user->is_profile_created())
       return profile_ == ProfileManager::GetActiveUserProfile();
   }
 #endif
   return true;
 }