Mark testControlsShownOnUnresponsiveRendererUponExitingTabSwitcherMode as flaky

TBR=tedchoc@chromium.org

Bug: 1099447
Change-Id: I7eb80d1bccac8736cdd0f910e2df7ab30846356e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2268638Reviewed-by: Patrick Noland <pnoland@chromium.org>
Commit-Queue: Patrick Noland <pnoland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782755}

chrome/android/javatests/src/org/chromium/chrome/browser/fullscreen/FullscreenManagerTest.java

@@ -30,6 +30,7 @@ import org.chromium.base.test.util.CallbackHelper;
 import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.DisabledTest;
 import org.chromium.base.test.util.Feature;
+import org.chromium.base.test.util.FlakyTest;
 import org.chromium.base.test.util.UrlUtils;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.compositor.layouts.OverviewModeController;
@@ -433,6 +434,7 @@ public class FullscreenManagerTest {
     @Test
     @LargeTest
     @Feature({"Fullscreen"})
+    @FlakyTest(message = "https://crbug.com/1099447")
     public void testControlsShownOnUnresponsiveRendererUponExitingTabSwitcherMode()
             throws Exception {
         FullscreenManagerTestUtils.disableBrowserOverrides();