MD Extensions: Show messages for no extensions, and for no search results

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 4299 matching lines @@
         </message>
         <message name="IDS_MD_EXTENSIONS_LOAD_ERROR_COULD_NOT_LOAD_MANIFEST" desc="The text to indicate that an extension's manifest could not be loaded.">
           Could not load manifest.
         </message>
         <message name="IDS_MD_EXTENSIONS_LOAD_ERROR_CANCEL" desc="The text on the button to close the dialog when an unpacked extension failed to load.">
           Cancel
         </message>
         <message name="IDS_MD_EXTENSIONS_LOAD_ERROR_RETRY" desc="The text on the button to retry loading an unpacked extension after a failed load.">
           Retry
         </message>
+        <message name="IDS_MD_EXTENSIONS_MSG_NO_EXT_OR_APP" desc="The text to display when there are no extensions installed.">

[Devlin, 2017/07/07 00:48:07]

nit: to display where?

[scottchen, 2017/07/07 23:08:42]

Done.

+          Find extensions and apps in the <ph name="BEGIN_LINK">&lt;a target="_blank" href="https://chrome.google.com/webstore/category/extensions"&gt;</ph>Chrome Web Store<ph name="END_LINK">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph>
+        </message>
+        <message name="IDS_MD_EXTENSIONS_MSG_NOT_FOUND" desc="The text to display when there are no search results">

[Devlin, 2017/07/07 00:48:07]

similarly, no search results where?

[scottchen, 2017/07/07 23:08:42]

Done.

+          Search results not found

[Devlin, 2017/07/07 00:48:07]

nit: "Search results not found" sounds funny to me.  Maybe "No results" or "No
matches"?  Do we have similar strings anywhere else?

[scottchen, 2017/07/07 23:08:42]

Settings and downloads both say "No Search Results Found" (I wanted to match
those but I manually typed it wrong). Does "No Search Results Found" sound okay?

[Devlin, 2017/07/10 20:23:53]

Yep, consistency is always good. :)

+        </message>
         <message name="IDS_MD_EXTENSIONS_PACK_DIALOG_TITLE" desc="The title of the dialog to pack an extension.">
           Pack extension
         </message>
         <message name="IDS_MD_EXTENSIONS_PACK_DIALOG_BROWSE_BUTTON" desc="The label of the button to browse the file system to select an extension directory or file.">
           Browse
         </message>
         <message name="IDS_MD_EXTENSIONS_PACK_DIALOG_EXTENSION_ROOT_LABEL" desc="The label of the input field for specifying the root directory to pack an extension from.">
           Extension root directory
         </message>
         <message name="IDS_MD_EXTENSIONS_PACK_DIALOG_KEY_FILE_LABEL" desc="The label of the input field for specifying the private key file for an extension being packed.">
@@ skipping 8043 matching lines @@
 
     <!-- Experimental Fullscreen Exit Control strings -->
     <if expr="toolkit_views">
       <message name="IDS_FULLSCREEN_EXIT_CONTROL_EXIT_FULLSCREEN" desc="Text displayed in a button that exits fullscreen mode.">
         Exit Fullscreen
       </message>
     </if>
   </messages>
  </release>
 </grit>