Disable Direct Composition for views_examples_exe and demo (aura_demo)

InProcessContextFactory isn't set up to properly support Direct
Composition.

BUG=936249

Change-Id: I34877fad76a40d8f141fb16c7a1d6d826d6c231a
Reviewed-on: https://chromium-review.googlesource.com/c/1492482
Commit-Queue: Robert Liao <robliao@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636530}

diff --git a/ui/aura/BUILD.gn b/ui/aura/BUILD.gn
index 59441b0..5a058e6 100644
--- a/ui/aura/BUILD.gn
+++ b/ui/aura/BUILD.gn

@@ -375,6 +375,7 @@
     "//ui/events",
     "//ui/gfx",
     "//ui/gfx/geometry",
+    "//ui/gl",
     "//ui/gl/init",
   ]