Disable DirectComposition underlays and complex transforms by default.

ui/gl/gl_switches.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/macros.h"
 #include "ui/gl/gl_switches.h"
 
 namespace gl {
 
 const char kGLImplementationDesktopName[]     = "desktop";
@@ skipping 135 matching lines @@
 }  // namespace switches
 
 namespace features {
 
 #if defined(OS_WIN)
 // Wait for D3D VSync signals in GPU process (as opposed to delay based VSync
 // generated in Browser process based on VSync parameters).
 const base::Feature kD3DVsync{"D3DVsync", base::FEATURE_DISABLED_BY_DEFAULT};
 #endif  // defined(OS_WIN)
 
+// Allow putting a video swapchain underneath the main swapchain, so overlays
+// can be used even if there are controls on top of the video. This requires
+// the DirectCompositionOverlays feature to be enabled.
+const base::Feature kDirectCompositionUnderlays{
+    "DirectCompositionUnderlays", base::FEATURE_DISABLED_BY_DEFAULT};
+
+// Allow putting content with complex transforms (e.g. rotations) into an
+// overlay.
+const base::Feature kDirectCompositionComplexOverlays{
+    "DirectCompositionComplexOverlays", base::FEATURE_DISABLED_BY_DEFAULT};
+
 }  // namespace features