cc: Fork OverlayCandidate to CALayerOverlay

cc/output/overlay_processor.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_processor.h"
 
 #include "cc/output/output_surface.h"
 #include "cc/output/overlay_strategy_single_on_top.h"
 #include "cc/output/overlay_strategy_underlay.h"
+#include "cc/quads/draw_quad.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 #include "ui/gfx/transform.h"
 
 namespace cc {
 
 OverlayProcessor::OverlayProcessor(OutputSurface* surface) : surface_(surface) {
 }
 
 void OverlayProcessor::Initialize() {
   DCHECK(surface_);
   OverlayCandidateValidator* validator =
       surface_->GetOverlayCandidateValidator();
   if (validator)
     validator->GetStrategies(&strategies_);
 }
 
 OverlayProcessor::~OverlayProcessor() {}
 
+bool OverlayProcessor::ProcessForCALayers(
+    ResourceProvider* resource_provider,
+    RenderPassList* render_passes,
+    CALayerOverlayList* ca_layer_overlays,
+    OverlayCandidateList* overlay_candidates) {
+  RenderPass* root_render_pass = render_passes->back();
+
+  OverlayCandidateValidator* overlay_validator =
+      surface_->GetOverlayCandidateValidator();
+  if (!overlay_validator || !overlay_validator->AllowCALayerOverlays())
+    return false;
+
+  if (!ProcessForCALayerOverlays(
+          resource_provider, gfx::RectF(root_render_pass->output_rect),
+          root_render_pass->quad_list, ca_layer_overlays))
+    return false;
+
+  // CALayer overlays are all-or-nothing. If all quads were replaced with
+  // layers then clear the list and remove the backbuffer from the overcandidate
+  // list.
+  overlay_candidates->clear();
+  render_passes->back()->quad_list.clear();
+  return true;
+}
+
 void OverlayProcessor::ProcessForOverlays(ResourceProvider* resource_provider,
                                           RenderPassList* render_passes,
                                           OverlayCandidateList* candidates,
                                           gfx::Rect* damage_rect) {
   for (auto strategy : strategies_) {
     if (strategy->Attempt(resource_provider, render_passes, candidates,
                           damage_rect)) {
       return;
     }
   }
 }
 
 }  // namespace cc