[CrOS Video Player] Add missing start test..

Bug: 909963
Change-Id: I5c443e1cd33d9ff88136904de9695b3aa12a58f6
Reviewed-on: https://chromium-review.googlesource.com/c/1481620Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Jazz Xu <jazzhsu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634368}

chrome/browser/chromeos/file_manager/video_player_browsertest.cc

@@ -67,10 +67,12 @@ IN_PROC_BROWSER_TEST_F(VideoPlayerBrowserTest, OpenSingleVideoOnDrive) {
 
 IN_PROC_BROWSER_TEST_F(VideoPlayerBrowserTest, OpenVideoWithSubtitle) {
   set_test_case_name("openVideoWithSubtitle");
+  StartTest();
 }
 
 IN_PROC_BROWSER_TEST_F(VideoPlayerBrowserTest, OpenVideoWithoutSubtitle) {
   set_test_case_name("openVideoWithoutSubtitle");
+  StartTest();
 }
 
 IN_PROC_BROWSER_TEST_F(VideoPlayerBrowserTest, CheckInitialElements) {