Adds a skeleton component app for Always-On Hotwording opt-in flow.

chrome/browser/extensions/component_loader.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/extensions/component_loader.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/file_util.h"
@@ skipping 495 matching lines @@
 
   if (!skip_session_components) {
     AddVideoPlayerExtension();
     AddFileManagerExtension();
     AddGalleryExtension();
 
     AddHangoutServicesExtension();
     AddHotwordHelperExtension();
     AddImageLoaderExtension();
 
+    if (command_line->HasSwitch(switches::kEnableExperimentalHotwording)) {

[rpetterson, 2014/08/19 18:55:29]

I'd make this like the other component extensions where you create a function
like AddHotwordVerificationApp() and do the check in that function. It's cleaner
and I foresee other checks such as field trials that we will need to include.

[kcarattini, 2014/08/20 03:13:27]

Done. Also moved the call to AddDefaultComponentExtensions() since there is no
longer a background page.

+      Add(IDR_HOTWORD_AUDIO_VERIFICATION_MANIFEST,
+          base::FilePath(FILE_PATH_LITERAL("hotword_audio_verification")));
+    }
+
 #if defined(ENABLE_SETTINGS_APP)
     Add(IDR_SETTINGS_APP_MANIFEST,
         base::FilePath(FILE_PATH_LITERAL("settings_app")));
 #endif
   }
 
   // If (!enable_background_extensions_during_testing || this isn't a test)
   //   install_feedback = false;
   bool install_feedback = enable_background_extensions_during_testing;
 #if defined(GOOGLE_CHROME_BUILD)
@@ skipping 107 matching lines @@
         off_the_record_context, Extension::GetBaseURLFromExtensionId(id));
     fileapi::FileSystemContext* file_system_context =
         content::BrowserContext::GetStoragePartitionForSite(
             off_the_record_context, site)->GetFileSystemContext();
     file_system_context->EnableTemporaryFileSystemInIncognito();
   }
 #endif
 }
 
 }  // namespace extensions