Auto merge of #190 - jdm:swap-change, r=asajeffrey

Adjust for surfman-chains swapping changes.

Depends on servo/surfman-chains#9.

Author: bors-servo

webxr/Cargo.toml

@@ -42,7 +42,7 @@ openxr = { git = "https://github.com/servo/openxrs.git", branch="secondary-views
 serde = { version = "1.0", optional = true }
 sparkle = "0.1"
 surfman = { version = "0.3", features = ["sm-x11"] }
-surfman-chains = "0.4"
+surfman-chains = "0.5"
 time = "0.1.42"
 
 [target.'cfg(target_os = "windows")'.dependencies]

webxr/glwindow/mod.rs

@@ -322,7 +322,11 @@ impl DeviceAPI for GlWindowDevice {
             Some(target_swap_chain) => {
                 // Rendering to a surfman swap chain
                 target_swap_chain
-                    .swap_buffers(&mut self.device, &mut self.context)
+                    .swap_buffers(
+                        &mut self.device,
+                        &mut self.context,
+                        surfman_chains::PreserveBuffer::No,
+                    )
                     .unwrap();
             }
             None => {

webxr/surfman_layer_manager.rs

@@ -233,7 +233,7 @@ impl LayerManagerAPI<SurfmanGL> for SurfmanLayerManager {
                 .recycle_surface_texture(device, context, surface_texture)
                 .map_err(|err| Error::BackendSpecific(format!("{:?}", err)))?;
             swap_chain
-                .swap_buffers(device, context)
+                .swap_buffers(device, context, surfman_chains::PreserveBuffer::No)
                 .map_err(|err| Error::BackendSpecific(format!("{:?}", err)))?;
         }
         Ok(())