Start and stop the hotword detector when the user opens/closes the launcher.

chrome/browser/resources/hotword/constants.js

Index: chrome/browser/resources/hotword/constants.js
diff --git a/chrome/browser/resources/hotword/constants.js b/chrome/browser/resources/hotword/constants.js
index 2aab1ed79f621055f0c26e8cf051bf1fa447750a..ab91b6ebbc016b47ef033497983ada883ab8350f 100644
--- a/chrome/browser/resources/hotword/constants.js
+++ b/chrome/browser/resources/hotword/constants.js
@@ -82,6 +82,15 @@ var NaClPlugin = {
 
 
 /**
+ * Source of a hotwording session request.
+ * @enum {string}
+ */
+var SessionSource = {
+  LAUNCHER: 'launcher'
+};
+
+

[Dan Beam, 2014/09/11 17:56:23]

general nit: we use 1 \n between top-level members in chrome code (instead of
closure-style code which is 2 \n)

[Anand Mistry (off Chromium), 2014/09/12 00:43:33]

Fixed for the whole file.

+/**
  * The browser UI language.
  * @const {string}
  */
@@ -96,6 +105,7 @@ return {
   Error: Error,
   Event: Event,
   NaClPlugin: NaClPlugin,
+  SessionSource: SessionSource,
   UI_LANGUAGE: UI_LANGUAGE
 };