[Sheriff] Disable GalleryWatchManagerTest.Basic on ChromeOS

Tbr: reillyg@chromium.org
NoTry: True
Bug: 936065
Change-Id: I373e9801f8de781745dbccb7b16a7c8c47159715
Reviewed-on: https://chromium-review.googlesource.com/c/1489714Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635659}

chrome/browser/media_galleries/gallery_watch_manager_unittest.cc

@@ -216,7 +216,13 @@ class GalleryWatchManagerTest : public GalleryWatchManagerObserver,
   DISALLOW_COPY_AND_ASSIGN(GalleryWatchManagerTest);
 };
 
-TEST_F(GalleryWatchManagerTest, Basic) {
+// TODO(crbug.com/936065): Flaky on ChromeOS.
+#if defined(OS_CHROMEOS)
+#define MAYBE_Basic DISABLED_Basic
+#else
+#define MAYBE_Basic Basic
+#endif
+TEST_F(GalleryWatchManagerTest, MAYBE_Basic) {
   base::ScopedTempDir temp_dir;
   ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
   MediaGalleryPrefId id = AddGallery(temp_dir.GetPath());