Ozone integration.

ui/ozone/public/overlay_manager_ozone.h

+// Copyright 2015 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.
+
+#ifndef UI_OZONE_PUBLIC_OVERLAY_MANAGER_OZONE_H_
+#define UI_OZONE_PUBLIC_OVERLAY_MANAGER_OZONE_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace ui {
+
+class OverlayCandidatesOzone;
+
+// Responsible for providing the oracles used to decide when overlays can be
+// used.
+class OverlayManagerOzone {
+ public:
+  virtual ~OverlayManagerOzone() {}
+
+  // Get the hal struct to check for overlay support.
+  virtual scoped_ptr<OverlayCandidatesOzone> CreateOverlayCandidates(
+      gfx::AcceleratedWidget w) = 0;
+
+  // Returns true if overlays can be shown at z-index 0, replacing the main
+  // surface. Combined with surfaceless extensions, it allows for an
+  // overlay-only mode.
+  virtual bool CanShowPrimaryPlaneAsOverlay() = 0;
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PUBLIC_OVERLAY_MANAGER_OZONE_H_