[Ozone] Fix SingleOnTop issue by checking if the quad is clipped.

ui/ozone/platform/drm/host/drm_overlay_candidates_host.cc

 // 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.
 
 #include "ui/ozone/platform/drm/host/drm_overlay_candidates_host.h"
 
 #include <algorithm>
 
 #include "ui/gfx/geometry/rect_conversions.h"
 #include "ui/ozone/common/gpu/ozone_gpu_messages.h"
@@ skipping 61 matching lines @@
     overlay = first;
   } else {
     return;
   }
   // 0.01 constant chosen to match DCHECKs in gfx::ToNearestRect and avoid
   // that code asserting on quads that we accept.
   if (!gfx::IsNearestRectWithinDistance(overlay->display_rect, 0.01f))
     return;
   if (overlay->transform == gfx::OVERLAY_TRANSFORM_INVALID)
     return;
+  if (overlay->is_clipped &&
+      !overlay->clip_rect.Contains(overlay->quad_rect_in_target_space))
+    return;
 
   OverlayCheck_Params lookup(*overlay);
   auto iter = cache_.Get(lookup);
   if (iter == cache_.end()) {
     cache_.Put(lookup, false);
     SendRequest(*candidates, lookup);
   } else {
     overlay->overlay_handled = iter->second;
   }
 }
@@ skipping 40 matching lines @@
   pending_checks_.pop_front();
 }
 
 void DrmOverlayCandidatesHost::ProcessResult(const OverlayCheck_Params& check,
                                              bool result) {
   if (result)
     cache_.Put(check, true);
 }
 
 }  // namespace ui