Add DCLayerOverlayProcessor and supporting DCLayer structures.

ui/gl/gl_surface.cc

Index: ui/gl/gl_surface.cc
diff --git a/ui/gl/gl_surface.cc b/ui/gl/gl_surface.cc
index 9bddfd3314750e54154574eda5581a668a0d7dfc..eb1c66b2531b5f77b9f902659321cf09e7d84361 100644
--- a/ui/gl/gl_surface.cc
+++ b/ui/gl/gl_surface.cc
@@ -156,6 +156,11 @@ void GLSurface::ScheduleCALayerInUseQuery(
   NOTIMPLEMENTED();
 }
 
+bool GLSurface::ScheduleDCLayer(const ui::DCRendererLayerParams& params) {
+  NOTIMPLEMENTED();
+  return false;
+}
+
 bool GLSurface::IsSurfaceless() const {
   return false;
 }
@@ -349,6 +354,11 @@ bool GLSurfaceAdapter::ScheduleOverlayPlane(int z_order,
       z_order, transform, image, bounds_rect, crop_rect);
 }
 
+bool GLSurfaceAdapter::ScheduleDCLayer(
+    const ui::DCRendererLayerParams& params) {
+  return surface_->ScheduleDCLayer(params);
+}
+
 bool GLSurfaceAdapter::IsSurfaceless() const {
   return surface_->IsSurfaceless();
 }