cc: Fork OverlayCandidate to CALayerOverlay

cc/output/overlay_processor.cc

Index: cc/output/overlay_processor.cc
diff --git a/cc/output/overlay_processor.cc b/cc/output/overlay_processor.cc
index a97623a4c2fa4917e36ea62440a6a6dd0dda4f4a..2eea63b3d602603c808c4c81513a22984964b034 100644
--- a/cc/output/overlay_processor.cc
+++ b/cc/output/overlay_processor.cc
@@ -7,6 +7,7 @@
 #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"
 
@@ -25,6 +26,31 @@ void OverlayProcessor::Initialize() {
 
 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,