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

chrome/browser/extensions/component_loader.cc

Index: chrome/browser/extensions/component_loader.cc
diff --git a/chrome/browser/extensions/component_loader.cc b/chrome/browser/extensions/component_loader.cc
index ec60802104249ce97a4f7f81436f4119d4924d87..ab6fa5adcd0b9112a50660a7aa719a1a2830505c 100644
--- a/chrome/browser/extensions/component_loader.cc
+++ b/chrome/browser/extensions/component_loader.cc
@@ -513,6 +513,11 @@ void ComponentLoader::AddDefaultComponentExtensionsWithBackgroundPages(
     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")));