exo: Add zcr_linux_explicit_synchronization_v1

components/exo/surface.cc

Index: components/exo/surface.cc
diff --git a/components/exo/surface.cc b/components/exo/surface.cc
index 8c0efb7909a8aede879c2c828d69e6f4c72479b5..900f01431fb2be5dccdbfaaf04d54fd4543b7137 100644
--- a/components/exo/surface.cc
+++ b/components/exo/surface.cc
@@ -36,6 +36,7 @@
 #include "ui/gfx/buffer_format_util.h"
 #include "ui/gfx/geometry/safe_integer_conversions.h"
 #include "ui/gfx/geometry/size_conversions.h"
+#include "ui/gfx/gpu_fence.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 #include "ui/gfx/path.h"
 #include "ui/gfx/skia_util.h"
@@ -261,6 +262,12 @@ void Surface::Attach(Buffer* buffer) {
   pending_buffer_.Reset(buffer ? buffer->AsWeakPtr() : base::WeakPtr<Buffer>());
 }
 
+void Surface::SetAcquireFence(std::unique_ptr<gfx::GpuFence> fence) {
+  TRACE_EVENT1("exo", "Surface::FenceAcquire", "fence", !!fence);
+
+  pending_fence_ = std::move(fence);
+}
+
 void Surface::Damage(const gfx::Rect& damage) {
   TRACE_EVENT1("exo", "Surface::Damage", "damage", damage.ToString());
 
@@ -467,6 +474,7 @@ void Surface::CommitSurfaceHierarchy() {
     has_pending_contents_ = false;
 
     current_buffer_ = std::move(pending_buffer_);
+    fence_ = std::move(pending_fence_);
 
     UpdateResource(true);
   }
@@ -716,8 +724,8 @@ void Surface::UpdateResource(bool client_usage) {
   if (current_buffer_.buffer()) {
     texture_mailbox_release_callback =
         current_buffer_.buffer()->ProduceTextureMailbox(
-            &texture_mailbox, state_.only_visible_on_secure_output,
-            client_usage);
+            &texture_mailbox, fence_.get(),
+            state_.only_visible_on_secure_output, client_usage);
   }
 
   if (texture_mailbox_release_callback) {