[Sheriff] Disable HitTestTabstrip on ChromeOS and Linux TSAN

This is flaking too heavily on those targets and causing CQ pain.

TBR=skau@chromium.org

Bug: 1015949
Change-Id: I39590be8207e67aca6f1718259802f2a02b569a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1878168Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708997}

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

@@ -74,7 +74,14 @@ class BrowserNonClientFrameViewTabbedTest
       : BrowserNonClientFrameViewTest(Browser::TYPE_NORMAL) {}
 };
 
-TEST_F(BrowserNonClientFrameViewTabbedTest, HitTestTabstrip) {
+// TODO(crbug.com/1015949): Flaky on ChromeOS and Linux TSAN.
+#if defined(OS_CHROMEOS) || (defined(OS_LINUX) && defined(THREAD_SANITIZER))
+#define MAYBE_HitTestTabstrip DISABLED_HitTestTabstrip
+#else
+#define MAYBE_HitTestTabstrip HitTestTabstrip
+#endif
+
+TEST_F(BrowserNonClientFrameViewTabbedTest, MAYBE_HitTestTabstrip) {
   gfx::Rect tabstrip_bounds =
       frame_view_->browser_view()->tabstrip()->GetLocalBounds();
   EXPECT_FALSE(tabstrip_bounds.IsEmpty());