Use the new hotword extension in the launcher when it is enabled.

chrome/common/chrome_switches.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/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 
 namespace switches {
@@ skipping 438 matching lines @@
 // Enables Domain Reliability Monitoring.
 const char kEnableDomainReliability[]          = "enable-domain-reliability";
 
 // Enable Enhanced Bookmarks.
 const char kEnhancedBookmarksExperiment[] = "enhanced-bookmarks-experiment";
 
 // Enables experimentation with ephemeral apps, which are launched without
 // installing in Chrome.
 const char kEnableEphemeralApps[]           = "enable-ephemeral-apps";
 
-// Enables experimental hotword detection features.
+// Enables experimental hotword detection features. These features include
+// using a new component extension for performing hotword detection, new UI
+// flows, and always-on detection.
 const char kEnableExperimentalHotwording[]  = "enable-experimental-hotwording";
 
 // Enables logging for extension activity.
 const char kEnableExtensionActivityLogging[] =
     "enable-extension-activity-logging";
 
 const char kEnableExtensionActivityLogTesting[] =
     "enable-extension-activity-log-testing";
 
 // Enable the fast unload controller, which speeds up tab/window close by
@@ skipping 905 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR CRAP TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead, please
 // put them in alphabetical order above, or in order inside the appropriate
 // ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches