exo: Implement zcr_linux_explicit_synchronization_v1

components/exo/display.cc

Index: components/exo/display.cc
diff --git a/components/exo/display.cc b/components/exo/display.cc
index df470b28122ce118cf389e2f6aa29f09d28e9c3c..d10d00d025cc6b1331e759ed6cecf55956d94051 100644
--- a/components/exo/display.cc
+++ b/components/exo/display.cc
@@ -101,6 +101,22 @@ std::unique_ptr<Buffer> Display::CreateLinuxDMABufBuffer(
       // COMMANDS_COMPLETED queries are required by native pixmaps.
       GL_COMMANDS_COMPLETED_CHROMIUM, use_zero_copy, is_overlay_candidate);
 }
+
+std::unique_ptr<gfx::GpuFence> Display::CreateLinuxFence(base::ScopedFD fd) {
+  TRACE_EVENT1("exo", "Display::CreateLinuxFence", "fd", fd.get());
+
+  gfx::GpuFenceHandle handle;
+
+  handle.fd.fd = fd.release();
+
+  std::unique_ptr<gfx::GpuFence> gpu_fence =
+      aura::Env::GetInstance()
+          ->context_factory()
+          ->GetGpuMemoryBufferManager()
+          ->CreateGpuFenceFromHandle(handle);
+
+  return std::move(gpu_fence);
+}
 #endif
 
 std::unique_ptr<ShellSurface> Display::CreateShellSurface(Surface* surface) {