Enables the 'hotword not listening' icon in the search box.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index bdda68ba328961f4dc255cd1d8a3f879baf87875..1c14bc057359296ca53c7590eb1706c5db6926df 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -14294,7 +14294,10 @@ Do you accept?
       Start Hangout
     </message>
     <message name="IDS_APP_LIST_START_SPEECH_RECOGNITION" desc="Tooltip text for the button to start the speech recognition.">
-      Start speech recognition
+      Click to start voice search
+    </message>
+    <message name="IDS_APP_LIST_HOTWORD_LISTENING" desc="Tooltip text for the mic button when it waits for the hotword.">
+      Click or say "Ok, Google" to start voice search
     </message>
     <if expr="not pp_ifdef('use_titlecase')">
       <message name="IDS_APP_LIST_CONTEXT_MENU_NEW_TAB" desc="Title text for the 'open new' context menu item of an app list item configured to open in a tab">