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..71476319e0f49d8e202c6613f6469c7bb3b86db0 100644
--- a/ui/compositor/layer.cc
+++ b/ui/compositor/layer.cc
@@ -675,6 +675,19 @@ void Layer::SetShowPrimarySurface(
     mirror->dest()->SetShowPrimarySurface(surface_info, ref_factory);
 }
 
+void Layer::SetFallbackSurface(
+    const cc::SurfaceInfo& surface_info,
+    scoped_refptr<cc::SurfaceReferenceFactory> ref_factory) {

[sadrul, 2017/03/31 05:23:00]

It doesn't look like |ref_factory| is needed?

[Fady Samuel, 2017/03/31 12:51:27]

Heh, you're right. It's a remnant of an old version of this function and I
missed removing it. Done.

+  DCHECK(type_ == LAYER_TEXTURED || type_ == LAYER_SOLID_COLOR);
+  DCHECK(surface_layer_);
+
+  // TODO(fsamuel): We should compute the gutter in the display compositor.
+  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);