In case of search add "Searching..." string to the spinner in the center.

chrome/browser/resources/file_manager/main.html

Index: chrome/browser/resources/file_manager/main.html
diff --git a/chrome/browser/resources/file_manager/main.html b/chrome/browser/resources/file_manager/main.html
index 84172980d0eab0cb3a2f5291519b96d2399ff2db..c3331b205ce71684ab5d8ba8356585d1f5b83aac 100644
--- a/chrome/browser/resources/file_manager/main.html
+++ b/chrome/browser/resources/file_manager/main.html
@@ -195,7 +195,10 @@
             <div id="list-container">
               <div class=detail-table tabindex=0></div>
               <grid class=thumbnail-grid tabindex=0></grid>
-              <div class=spinner></div>
+              <div id="spinner-container">
+                <div id="spinner-without-text" class="spinner"></div>
+                <div id="spinner-with-text" class="spinner"></div>
+              </div>
               <div class="gdrive-welcome page"></div>
               <div id="no-search-results"></div>
             </div>