cc: Allow overlay candidates with transforms.

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/buffer_types.h"
@@ skipping 19 matching lines @@
     RenderPass* render_pass,
     OverlayCandidateList* candidate_list,
     std::vector<gfx::Rect>* content_bounds) {
   QuadList* quad_list = &render_pass->quad_list;
   // Build a list of candidates with the associated quad.
   OverlayCandidate best_candidate;
   QuadList::Iterator best_quad_it = quad_list->end();
   for (auto it = quad_list->begin(); it != quad_list->end(); ++it) {
     OverlayCandidate candidate;
     if (OverlayCandidate::FromDrawQuad(resource_provider, *it, &candidate) &&
-        // TODO(dcastagna): Remove this once drm platform supports transforms.
-        candidate.transform == gfx::OVERLAY_TRANSFORM_NONE &&
         !OverlayCandidate::IsOccluded(candidate, quad_list->cbegin(), it)) {
       // We currently reject quads with alpha that do not request alpha blending
       // since the alpha channel might not be set to 1 and we're not disabling
       // blending when scanning out.
       // TODO(dcastagna): We should support alpha formats without blending using
       // the opaque FB at scanout.
       if (std::find(std::begin(kOverlayFormatsWithAlpha),
                     std::end(kOverlayFormatsWithAlpha),
                     candidate.format) != std::end(kOverlayFormatsWithAlpha) &&
           it->shared_quad_state->blend_mode == SkBlendMode::kSrc)
@@ skipping 33 matching lines @@
   if (overlay_candidate.overlay_handled) {
     quad_list->EraseAndInvalidateAllPointers(candidate_iterator);
     candidate_list->swap(new_candidate_list);
     return true;
   }
 
   return false;
 }
 
 }  // namespace cc