Add DIRECT_COMPOSITION GpuMemoryBuffer type.

ui/gfx/linux/client_native_pixmap_factory_dmabuf.cc

Index: ui/gfx/linux/client_native_pixmap_factory_dmabuf.cc
diff --git a/ui/gfx/linux/client_native_pixmap_factory_dmabuf.cc b/ui/gfx/linux/client_native_pixmap_factory_dmabuf.cc
index a91e50645fe50e971e647879c5ce6afb75296879..bba7cf86241c69265f9e22ab1537925490498e46 100644
--- a/ui/gfx/linux/client_native_pixmap_factory_dmabuf.cc
+++ b/ui/gfx/linux/client_native_pixmap_factory_dmabuf.cc
@@ -83,6 +83,8 @@ class ClientNativePixmapFactoryDmabuf : public ClientNativePixmapFactory {
         return false;
 #endif
       }
+      case gfx::BufferUsage::SCANOUT_ASYNC:
+        break;
     }
     NOTREACHED();
     return false;
@@ -108,6 +110,8 @@ class ClientNativePixmapFactoryDmabuf : public ClientNativePixmapFactory {
         for (const auto& fd : handle.fds)
           base::ScopedFD scoped_fd(fd.fd);
         return base::WrapUnique(new ClientNativePixmapOpaque);
+      case gfx::BufferUsage::SCANOUT_ASYNC:
+        break;
     }
     NOTREACHED();
     return nullptr;