exo: Implement zcr_linux_explicit_synchronization_v1

components/exo/display.h

Index: components/exo/display.h
diff --git a/components/exo/display.h b/components/exo/display.h
index d4f3b3d08065b522f902612fe7fabe6c23a806de..aca32c2dd42b7dbaa10bcb24cc2cb114a9cc7ddb 100644
--- a/components/exo/display.h
+++ b/components/exo/display.h
@@ -13,14 +13,18 @@
 #include "base/macros.h"
 #include "base/memory/shared_memory_handle.h"
 
-#if defined(USE_OZONE)
+#if defined(OS_LINUX)
 #include "base/files/scoped_file.h"
+#endif
+
+#if defined(USE_OZONE)
 #include "ui/gfx/buffer_types.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/native_pixmap_handle.h"
 #endif
 
 namespace gfx {
+class GpuFence;
 class Point;
 }
 
@@ -61,7 +65,12 @@ class Display {
       gfx::BufferFormat format,
       const std::vector<gfx::NativePixmapPlane>& planes,
       std::vector<base::ScopedFD>&& fds);
-#endif
+#endif  // defined(USE_OZONE)
+
+#if defined(OS_LINUX)
+  // Creates a GpuFence for a Linux fence file descriptor.
+  std::unique_ptr<gfx::GpuFence> CreateLinuxFence(base::ScopedFD fd);
+#endif  // defined(OS_LINUX)
 
   // Creates a shell surface for an existing surface.
   std::unique_ptr<ShellSurface> CreateShellSurface(Surface* surface);