Add disable crbug link for BrowserNonClientFrameViewAshTest.AppHeaderVisibilityInTabletModeTest

Bug: 1028336
Tbr: sky@chromium.org
Change-Id: I8392785669999816732aab67f4bed7e02ba37989
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1935834Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719187}

chrome/browser/ui/views/frame/browser_non_client_frame_view_ash_browsertest.cc

@@ -1287,6 +1287,8 @@ IN_PROC_BROWSER_TEST_P(BrowserNonClientFrameViewAshTest,
 
 // Test that for a browser app window, its caption buttons may or may not hide
 // in tablet mode.
+// Disable due to use-of-uninitialized value error on ChromeOS.
+// https://crbug.com/1028336.
 IN_PROC_BROWSER_TEST_P(BrowserNonClientFrameViewAshTest,
                        DISABLED_AppHeaderVisibilityInTabletModeTest) {
   // Create a browser app window.