cros: add new search box hint text for launcher

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="utf-8"?>
 
 <!--
 This file contains definitions of resources that will be translated for each
 locale.  The variables is_win, is_macosx, is_linux, and is_posix are available
 for making strings OS specific.  Other platform defines such as use_titlecase
 are declared in build/common.gypi.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 11125 matching lines @@
       <if expr="enable_app_list">
         <message name="IDS_APP_LIST_START_SPEECH_RECOGNITION" desc="Tooltip text for the button to start the 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>
         <message name="IDS_SEARCH_BOX_HINT" desc="Hint text for the search box in app list window.">
           Search or type URL
         </message>
+        <message name="IDS_SEARCH_BOX_HINT_FULLSCREEN" desc="Hint text for the search box in fullscreen app list window.">
+          Search your Chromebook, apps, web...

[xiyuan, 2017/06/12 19:24:55]

Usually we use a place holder for "Chromebook" and replace it with what
ash::GetChromeOSDeviceName() returns.

e.g.

https://cs.chromium.org/chromium/src/chrome/browser/chromeos/arc/arc_auth_not...

[Qiang(Joe) Xu, 2017/06/12 21:45:31]

done

+        </message>
         <message name="IDS_SEARCH_BOX_HOTWORD_HINT" desc="Hint text for the search box in app list window when the hotword is enabled.">
           Search, or say "Ok Google"
         </message>
         <if expr="not 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">
             New tab
           </message>
           <message name="IDS_APP_LIST_CONTEXT_MENU_NEW_WINDOW" desc="Title text for the 'open new' context menu item of an app list item configured to open windowed">
             New window
           </message>
@@ skipping 1179 matching lines @@
       <message name="IDS_VIDEO_AUDIO_CALL_NOTIFICATION_TEXT_2" desc="Text to be shown as a notification when a WebRTC video and audio call is in progress" formatter_data="android_java">
         Accessing audio and video input
       </message>
       <message name="IDS_SCREEN_CAPTURE_NOTIFICATION_TEXT_2" desc="Text to be shown as a notification when screen capture is in progress.">
         Sharing screen
       </message>
     </if>
   </messages>
  </release>
 </grit>