Aura-Mus: Enable Surface Synchronization behind flag

ui/compositor/layer.cc

Index: ui/compositor/layer.cc
diff --git a/ui/compositor/layer.cc b/ui/compositor/layer.cc
index c235821bf6ae9a4e778f73442b8a7988169fae50..87edbdf6226dfe422f0f07fbf468d0a516177f9c 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.

[sadrul, 2017/03/31 01:26:20]

Maybe just comment that we need to fix for guttering. Exactly how we gutter may
be something different?

[Fady Samuel, 2017/03/31 01:57:43]

I've gotten rid of the second sentence. We should compute the gutter in the
display compositor is something we agreed on.

+  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);