Ensure setSearchQuery() performs a search for Drive as well

This is a follow-up CL for crrev.com/c/2408502
setSearchQuery() is only used when LaunchParam.searchQuery is filled
at this point.

Bug: 1126742
Test: browser_tests --gtest_filter="*FilesApp*SearchQueryLaunchParam" (Added by crrev.com/c/2434008)
Change-Id: Id1bcc834ac9367de24cb29bc30fc357b5ec20580
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434070Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Satoshi Niwa <niwa@chromium.org>
Auto-Submit: Satoshi Niwa <niwa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811542}

ui/file_manager/file_manager/foreground/js/search_controller.js

@@ -95,6 +95,9 @@ class SearchController {
     this.searchBox_.inputElement.focus();
     this.searchBox_.inputElement.value = searchQuery;
     this.onTextChange_();
+    if (this.isOnDrive_) {
+      this.onItemSelect_();
+    }
   }
 
   /**