Disable flaking viz_browser_tests

Some more tests have started flaking on Windows in viz_browser_tests
with unknown timeouts. This disables them.

TBR=kylechar@chromium.org
TEST=viz_browser_tests

Change-Id: I7cc2c4a589d9517fcaf787f4a6aaa1642a1d6485
Reviewed-on: https://chromium-review.googlesource.com/993633Reviewed-by: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547804}

testing/buildbot/filters/viz.browser_tests.filter

@@ -93,7 +93,10 @@
 -ThumbnailTest.ShouldContainProperContentIfCapturedOnTabSwitch
 
 # Windows timeouts. https://crbug.com/821029
+-BrowserNavigatorTest.Disposition_NewPopupFromAppPopup
+-ExtensionApiCaptureTest.CaptureNullWindow
 -ManifestVerifierBrowserTest.*
+-OmniboxPopupContentsViewTest.ThemeIntegration/*
 -PDFIsolatedExtensionTest.MultipleDomains
 -PrefHashBrowserTest*
 -UserInitiatedRunsDisabled*