Reland "Added an extra sync token field for extra command buffer..."

gpu/gles2_conform_support/egl/display.cc

Index: gpu/gles2_conform_support/egl/display.cc
diff --git a/gpu/gles2_conform_support/egl/display.cc b/gpu/gles2_conform_support/egl/display.cc
index 3b20d8179d72c63fb41d3a0a39be2f5eceafebd2..f79a4531dc3fd5966a2074917b1e0a3271fdd06e 100644
--- a/gpu/gles2_conform_support/egl/display.cc
+++ b/gpu/gles2_conform_support/egl/display.cc
@@ -345,6 +345,10 @@ uint64_t Display::GetCommandBufferID() const {
   return 0;
 }
 
+int32_t Display::GetExtraCommandBufferData() const {
+  return 0;
+}
+
 uint64_t Display::GenerateFenceSyncRelease() {
   return next_fence_sync_release_++;
 }