WIP: Surface Synchronization System

ui/compositor/layer.cc

Index: ui/compositor/layer.cc
diff --git a/ui/compositor/layer.cc b/ui/compositor/layer.cc
index 3467b0ebf1ef6b217fd970bde12a032ebe89caed..7f944fa3550310bb1121574f6f520b1d8e3933d2 100644
--- a/ui/compositor/layer.cc
+++ b/ui/compositor/layer.cc
@@ -675,6 +675,21 @@ void Layer::SetShowPrimarySurface(
     mirror->dest()->SetShowPrimarySurface(surface_info, ref_factory);
 }
 
+void Layer::SetFallbackSurface(
+    const cc::SurfaceInfo& surface_info,
+    scoped_refptr<cc::SurfaceReferenceFactory> ref_factory) {
+  DCHECK(type_ == LAYER_TEXTURED || type_ == LAYER_SOLID_COLOR);
+  DCHECK(surface_layer_);
+
+  // TODO(fsamuel): We should compute the gutter in the display compositor.
+  // If the SurfaceLayer is NOT opaque, then the parent client should manually
+  // insert gutter layers.
+  surface_layer_->SetFallbackSurfaceInfo(surface_info);
+
+  for (const auto& mirror : mirrors_)
+    mirror->dest()->SetFallbackSurface(surface_info, ref_factory);
+}
+
 void Layer::SetShowSolidColorContent() {
   DCHECK_EQ(type_, LAYER_SOLID_COLOR);