[Downloads UI] Implement search

chrome/android/java/strings/android_chrome_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- android_chrome_strings.grd contains strings for Chrome for Android.
 
 FAQ:
   - How do I add, change, or remove a string?
       Just update this file.
   - Translations will happen automatically??
       Yes, indeed. Just add your string before the branch point and
       make the description good.
@@ skipping 1813 matching lines @@
       </message>
       <message name="IDS_DOWNLOAD_PAGE" desc="Download this page.">
         Download page
       </message>
       <message name="IDS_DOWNLOAD_MANAGER_UI_EMPTY" desc="Indicates that there are no downloaded items.">
         No downloads here
       </message>
       <message name="IDS_DOWNLOAD_MANAGER_OPEN_WITH" desc="Menu item to open an item with another app.">
         Open with…
       </message>
+      <message name="IDS_DOWNLOAD_MANAGER_SEARCH" desc="Placeholder text for the input field that allows users to search downloads.">
+        Search your downloads
+      </message>
+      <message name="IDS_DOWNLOAD_MANAGER_NO_RESULTS" desc="Text explaining that no download items matched a search query.">
+        No downloads found
+      </message>
 
       <!-- Browsing History UI -->
       <message name="IDS_HISTORY_MANAGER_EMPTY" desc="Indicates that there are no browsing history items.">
         No history here
       </message>
       <message name="IDS_HISTORY_MANAGER_NO_RESULTS" desc="Text explaining that no browsing history items match a search query.">
         No history found
       </message>
       <message name="IDS_HISTORY_MANAGER_SEARCH" desc="Placeholder text for the input field that allows users to search browsing history.">
         Search your history
@@ skipping 1065 matching lines @@
       </message>
       <message name="IDS_KEYBOARD_SHORTCUT_CHROME_FEATURE_GROUP_HEADER" desc="A text label that appears above a list of shortcuts that are related to the Chrome app features. This group is part of several groups of keyboard shortcuts all shown in a dialog.">
         Google Chrome feature shortcuts
       </message>
       <message name="IDS_KEYBOARD_SHORTCUT_WEBPAGE_GROUP_HEADER" desc="A text label that appears above a list of shortcuts that are related to manipulation of the current tab window. This group is part of several groups of keyboard shortcuts all shown in a dialog.">
         Webpage shortcuts
       </message>
     </messages>
   </release>
 </grit>