cc: Make SingleOnTop strategy reject transformed overlays.

cc/output/overlay_strategy_single_on_top.cc

 // Copyright 2014 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 "cc/output/overlay_strategy_single_on_top.h"
 
 #include "cc/base/math_util.h"
 #include "cc/output/overlay_candidate_validator.h"
 #include "cc/quads/draw_quad.h"
 #include "ui/gfx/geometry/rect_conversions.h"
@@ skipping 21 matching lines @@
   }
 
   return false;
 }
 
 bool OverlayStrategySingleOnTop::TryOverlay(
     QuadList* quad_list,
     OverlayCandidateList* candidate_list,
     const OverlayCandidate& candidate,
     QuadList::Iterator candidate_iterator) {
+  // Reject transformed overlays.
+  // TODO(dcastagna): Remove this once drm platform supports transforms.
+  if (candidate.transform != gfx::OVERLAY_TRANSFORM_NONE)
+    return false;
   // Check that no prior quads overlap it.
   if (OverlayCandidate::IsOccluded(candidate, quad_list->cbegin(),
                                    candidate_iterator))
     return false;
 
   // Add the overlay.
   OverlayCandidateList new_candidate_list = *candidate_list;
   new_candidate_list.push_back(candidate);
   new_candidate_list.back().plane_z_order = 1;
 
   // Check for support.
   capability_checker_->CheckOverlaySupport(&new_candidate_list);
 
   const OverlayCandidate& overlay_candidate = new_candidate_list.back();
   // If the candidate can be handled by an overlay, create a pass for it.
   if (overlay_candidate.overlay_handled) {
     quad_list->EraseAndInvalidateAllPointers(candidate_iterator);
     candidate_list->swap(new_candidate_list);
     return true;
   }
 
   return false;
 }
 
 }  // namespace cc