ozone: Add overlay candidate implementation that queries support via IPC

ui/ozone/platform/drm/gpu/drm_window.h

Index: ui/ozone/platform/drm/gpu/drm_window.h
diff --git a/ui/ozone/platform/drm/gpu/drm_window.h b/ui/ozone/platform/drm/gpu/drm_window.h
index 1164f177d6093aef5b82b747d44678c31b6c8a4a..36d3b5b7598333a3f29a75a0e92ba1b6dc66c7bc 100644
--- a/ui/ozone/platform/drm/gpu/drm_window.h
+++ b/ui/ozone/platform/drm/gpu/drm_window.h
@@ -29,6 +29,8 @@ namespace ui {
 class DrmBuffer;
 class DrmDeviceManager;
 class HardwareDisplayController;
+struct OverlayCheck_Params;
+class ScanoutBufferGenerator;
 class ScreenManager;
 
 // A delegate of the platform window (DrmWindow) on the GPU process. This is
@@ -84,6 +86,8 @@ class OZONE_EXPORT DrmWindow {
   void QueueOverlayPlane(const OverlayPlane& plane);
 
   bool SchedulePageFlip(bool is_sync, const SwapCompletionCallback& callback);
+  bool TestPageFlip(const std::vector<OverlayCheck_Params>& planes,
+                    ScanoutBufferGenerator* buffer_generator);
 
   // Returns the last buffer associated with this window.
   const OverlayPlane* GetLastModesetBuffer();