drive: Add a very basic browser test for the autocomplete feature

chrome/browser/chromeos/extensions/file_manager/file_manager_browsertest.cc

Index: chrome/browser/chromeos/extensions/file_manager/file_manager_browsertest.cc
diff --git a/chrome/browser/chromeos/extensions/file_manager/file_manager_browsertest.cc b/chrome/browser/chromeos/extensions/file_manager/file_manager_browsertest.cc
index 92cf961538282a735fb472caef383761dd617f1f..78e5dc490433988a9b30e58ca75484e2f613b32b 100644
--- a/chrome/browser/chromeos/extensions/file_manager/file_manager_browsertest.cc
+++ b/chrome/browser/chromeos/extensions/file_manager/file_manager_browsertest.cc
@@ -707,4 +707,12 @@ IN_PROC_BROWSER_TEST_P(FileManagerBrowserDriveTest, TestOpenRecent) {
   ASSERT_TRUE(catcher.GetNextResult()) << catcher.message();
 }
 
+IN_PROC_BROWSER_TEST_P(FileManagerBrowserDriveTest, TestAutocomplete) {
+  drive_test_util::WaitUntilDriveMountPointIsAdded(browser()->profile());
+
+  ResultCatcher catcher;
+  StartTest("autocomplete");
+  ASSERT_TRUE(catcher.GetNextResult()) << catcher.message();
+}
+
 }  // namespace