Work around a GCC5 bug where it fails to choose the correct base::span
constructor.

Adapted from this commit:
https://gitweb.gentoo.org/repo/gentoo.git/commit/www-client/chromium?id=7843d29ab07411a9c70962fb90b4cd1546910242

--- a/gpu/ipc/common/mailbox_struct_traits.h
+++ b/gpu/ipc/common/mailbox_struct_traits.h
@@ -15,7 +15,7 @@ namespace mojo {
 template <>
 struct StructTraits<gpu::mojom::MailboxDataView, gpu::Mailbox> {
   static base::span<const int8_t> name(const gpu::Mailbox& mailbox) {
-    return mailbox.name;
+    return base::make_span(mailbox.name);
   }
   static bool Read(gpu::mojom::MailboxDataView data, gpu::Mailbox* out);
 };
--- a/services/viz/public/cpp/compositing/filter_operation_struct_traits.h
+++ b/services/viz/public/cpp/compositing/filter_operation_struct_traits.h
@@ -134,7 +134,7 @@ struct StructTraits<viz::mojom::FilterOperationDataView, cc::FilterOperation> {
   static base::span<const float> matrix(const cc::FilterOperation& operation) {
     if (operation.type() != cc::FilterOperation::COLOR_MATRIX)
       return base::span<const float>();
-    return operation.matrix();
+    return base::make_span(operation.matrix());
   }

   static base::span<const gfx::Rect> shape(
--- a/services/viz/public/cpp/compositing/quads_struct_traits.h
+++ b/services/viz/public/cpp/compositing/quads_struct_traits.h
@@ -308,7 +308,7 @@
   static base::span<const float> vertex_opacity(const viz::DrawQuad& input) {
     const viz::TextureDrawQuad* quad =
         viz::TextureDrawQuad::MaterialCast(&input);
-    return quad->vertex_opacity;
+    return base::make_span(quad->vertex_opacity);
   }
 
   static bool y_flipped(const viz::DrawQuad& input) {