Add tests for exiting from nested fullscreen

third_party/WebKit/LayoutTests/external/wpt/MANIFEST.json

Index: third_party/WebKit/LayoutTests/external/wpt/MANIFEST.json
diff --git a/third_party/WebKit/LayoutTests/external/wpt/MANIFEST.json b/third_party/WebKit/LayoutTests/external/wpt/MANIFEST.json
index c4464d803268202ebfc759e15cea5fd3f28f9345..5936b03d96aff3311e4361cd19a2a279fef3171c 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/MANIFEST.json
+++ b/third_party/WebKit/LayoutTests/external/wpt/MANIFEST.json
@@ -13,6 +13,18 @@
      {}
     ]
    ],
+   "fullscreen/api/document-exit-fullscreen-nested-in-iframe-manual.html": [
+    [
+     "/fullscreen/api/document-exit-fullscreen-nested-in-iframe-manual.html",
+     {}
+    ]
+   ],
+   "fullscreen/api/document-exit-fullscreen-nested-manual.html": [
+    [
+     "/fullscreen/api/document-exit-fullscreen-nested-manual.html",
+     {}
+    ]
+   ],
    "fullscreen/api/document-exit-fullscreen-timing-manual.html": [
     [
      "/fullscreen/api/document-exit-fullscreen-timing-manual.html",
@@ -61393,6 +61405,14 @@
    "673d72414fab3dbb677d21a05008d9014daf71bf",
    "manual"
   ],
+  "fullscreen/api/document-exit-fullscreen-nested-in-iframe-manual.html": [
+   "521f776f725c48e6f38bd8af3e6bff498c8ea604",
+   "manual"
+  ],
+  "fullscreen/api/document-exit-fullscreen-nested-manual.html": [
+   "5ddaf5fd8c2aef02fc4cefffa80a569e513a5491",
+   "manual"
+  ],
   "fullscreen/api/document-exit-fullscreen-timing-manual-expected.txt": [
    "bb2508e35e8e52593e6fc4282f17c186f31e6bd3",
    "support"