exo: Update wl_output to version 3

There is wayland protocol error when unplugging the external display, because
wl_output version is not correct.

Bug:  961863
Test: Manual test by unplugging the external display. Wayland service does not
      reconnect due to protocol error.

Change-Id: I9c2ec8c942f4d53a3e750a56f5a55458763561bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1699507
Auto-Submit: Cici Ruan <cuicuiruan@google.com>
Commit-Queue: Cici Ruan <cuicuiruan@google.com>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Dominik Laskowski <domlaskowski@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678046}

components/exo/wayland/wl_output.cc

@@ -22,6 +22,12 @@ namespace wayland {
 ////////////////////////////////////////////////////////////////////////////////
 // wl_output_interface:
 
+void output_release(wl_client* client, wl_resource* resource) {
+  wl_resource_destroy(resource);
+}
+
+const struct wl_output_interface output_implementation = {output_release};
+
 void bind_output(wl_client* client, void* data, uint32_t version, uint32_t id) {
   WaylandDisplayOutput* output = static_cast<WaylandDisplayOutput*>(data);
 
@@ -29,7 +35,7 @@ void bind_output(wl_client* client, void* data, uint32_t version, uint32_t id) {
       client, &wl_output_interface, std::min(version, kWlOutputVersion), id);
 
   SetImplementation(
-      resource, nullptr,
+      resource, &output_implementation,
       std::make_unique<WaylandDisplayObserver>(output->id(), resource));
 }
 

components/exo/wayland/wl_output.h

@@ -12,7 +12,7 @@ struct wl_client;
 namespace exo {
 namespace wayland {
 
-constexpr uint32_t kWlOutputVersion = 2;
+constexpr uint32_t kWlOutputVersion = 3;
 
 void bind_output(wl_client* client, void* data, uint32_t version, uint32_t id);