[ozone/wayland] Add zwp_linux_explicit_synchronization interface.

This interface lets a wayland client provide in-fences to a wayland
server and receive out-fences (or an immediate release) back.

Adding this interface to ozone/wayland is a required step for adding
support for passing in-fences and out-fences between Chrome (wayland
client) and the wayland server.

Passing fences around lets buffers be used more efficiently by:
1. Moving the wait on a buffer to be available for scan-out closer to
the place where it is scanned out.
2. Letting clients know when they can re-use buffers more quickly
(rather than via IPC).

Bug: 1120244
Test: compiles
Change-Id: Ib864255f2d30e5b9c515f071e8336a4e62a6c916
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368932
Commit-Queue: Eliot Courtney <edcourtney@chromium.org>
Reviewed-by: Maksim Sisov (GMT+3) <msisov@igalia.com>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Kramer Ge <fangzhoug@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801272}

ui/ozone/platform/wayland/BUILD.gn

@@ -150,6 +150,7 @@ source_set("wayland") {
     "//third_party/wayland-protocols:gtk_primary_selection_protocol",
     "//third_party/wayland-protocols:keyboard_extension_protocol",
     "//third_party/wayland-protocols:linux_dmabuf_protocol",
+    "//third_party/wayland-protocols:linux_explicit_synchronization_protocol",
     "//third_party/wayland-protocols:presentation_time_protocol",
     "//third_party/wayland-protocols:text_input_protocol",
     "//third_party/wayland-protocols:wayland_drm_protocol",

ui/ozone/platform/wayland/common/wayland_object.cc

@@ -8,6 +8,7 @@
 #include <gtk-primary-selection-client-protocol.h>
 #include <keyboard-extension-unstable-v1-client-protocol.h>
 #include <linux-dmabuf-unstable-v1-client-protocol.h>
+#include <linux-explicit-synchronization-unstable-v1-client-protocol.h>
 #include <presentation-time-client-protocol.h>
 #include <text-input-unstable-v1-client-protocol.h>
 #include <wayland-client.h>
@@ -215,6 +216,25 @@ const wl_interface* ObjectTraits<zwp_linux_dmabuf_v1>::interface =
 void (*ObjectTraits<zwp_linux_dmabuf_v1>::deleter)(zwp_linux_dmabuf_v1*) =
     &zwp_linux_dmabuf_v1_destroy;
 
+const wl_interface* ObjectTraits<zwp_linux_buffer_release_v1>::interface =
+    &zwp_linux_buffer_release_v1_interface;
+void (*ObjectTraits<zwp_linux_buffer_release_v1>::deleter)(
+    zwp_linux_buffer_release_v1*) = &zwp_linux_buffer_release_v1_destroy;
+
+const wl_interface*
+    ObjectTraits<zwp_linux_explicit_synchronization_v1>::interface =
+        &zwp_linux_explicit_synchronization_v1_interface;
+void (*ObjectTraits<zwp_linux_explicit_synchronization_v1>::deleter)(
+    zwp_linux_explicit_synchronization_v1*) =
+    &zwp_linux_explicit_synchronization_v1_destroy;
+
+const wl_interface*
+    ObjectTraits<zwp_linux_surface_synchronization_v1>::interface =
+        &zwp_linux_surface_synchronization_v1_interface;
+void (*ObjectTraits<zwp_linux_surface_synchronization_v1>::deleter)(
+    zwp_linux_surface_synchronization_v1*) =
+    &zwp_linux_surface_synchronization_v1_destroy;
+
 const wl_interface* ObjectTraits<zxdg_shell_v6>::interface =
     &zxdg_shell_v6_interface;
 void (*ObjectTraits<zxdg_shell_v6>::deleter)(zxdg_shell_v6*) =

ui/ozone/platform/wayland/common/wayland_object.h

@@ -44,6 +44,9 @@ struct zaura_surface;
 struct zcr_keyboard_extension_v1;
 struct zcr_extended_keyboard_v1;
 struct zwp_linux_dmabuf_v1;
+struct zwp_linux_buffer_release_v1;
+struct zwp_linux_explicit_synchronization_v1;
+struct zwp_linux_surface_synchronization_v1;
 struct zxdg_shell_v6;
 struct zxdg_surface_v6;
 struct zxdg_toplevel_v6;
@@ -279,6 +282,24 @@ struct ObjectTraits<zwp_linux_dmabuf_v1> {
   static void (*deleter)(zwp_linux_dmabuf_v1*);
 };
 
+template <>
+struct ObjectTraits<zwp_linux_buffer_release_v1> {
+  static const wl_interface* interface;
+  static void (*deleter)(zwp_linux_buffer_release_v1*);
+};
+
+template <>
+struct ObjectTraits<zwp_linux_explicit_synchronization_v1> {
+  static const wl_interface* interface;
+  static void (*deleter)(zwp_linux_explicit_synchronization_v1*);
+};
+
+template <>
+struct ObjectTraits<zwp_linux_surface_synchronization_v1> {
+  static const wl_interface* interface;
+  static void (*deleter)(zwp_linux_surface_synchronization_v1*);
+};
+
 template <>
 struct ObjectTraits<zxdg_shell_v6> {
   static const wl_interface* interface;

ui/ozone/platform/wayland/host/wayland_connection.cc

@@ -52,6 +52,7 @@ constexpr uint32_t kMaxXdgShellVersion = 1;
 constexpr uint32_t kMaxDeviceManagerVersion = 3;
 constexpr uint32_t kMaxWpPresentationVersion = 1;
 constexpr uint32_t kMaxTextInputManagerVersion = 1;
+constexpr uint32_t kMaxExplicitSyncVersion = 2;
 constexpr uint32_t kMinAuraShellVersion = 10;
 constexpr uint32_t kMinWlDrmVersion = 2;
 constexpr uint32_t kMinWlOutputVersion = 2;
@@ -331,6 +332,12 @@ void WaylandConnection::Global(void* data,
     connection->primary_selection_device_manager_ =
         std::make_unique<GtkPrimarySelectionDeviceManager>(manager.release(),
                                                            connection);
+  } else if (!connection->linux_explicit_synchronization_ &&
+             (strcmp(interface, "zwp_linux_explicit_synchronization_v1") ==
+              0)) {
+    connection->linux_explicit_synchronization_ =
+        wl::Bind<zwp_linux_explicit_synchronization_v1>(
+            registry, name, std::min(version, kMaxExplicitSyncVersion));
   } else if (!connection->zwp_dmabuf_ &&
              (strcmp(interface, "zwp_linux_dmabuf_v1") == 0)) {
     wl::Object<zwp_linux_dmabuf_v1> zwp_linux_dmabuf =

ui/ozone/platform/wayland/host/wayland_connection.h

@@ -60,6 +60,10 @@ class WaylandConnection {
   zwp_text_input_manager_v1* text_input_manager_v1() const {
     return text_input_manager_v1_.get();
   }
+  zwp_linux_explicit_synchronization_v1* linux_explicit_synchronization_v1()
+      const {
+    return linux_explicit_synchronization_.get();
+  }
 
   void set_serial(uint32_t serial) { serial_ = serial; }
   uint32_t serial() const { return serial_; }
@@ -167,6 +171,8 @@ class WaylandConnection {
   wl::Object<zcr_keyboard_extension_v1> keyboard_extension_v1_;
   wl::Object<zwp_text_input_manager_v1> text_input_manager_v1_;
   wl::Object<zaura_shell> aura_shell_;
+  wl::Object<zwp_linux_explicit_synchronization_v1>
+      linux_explicit_synchronization_;
 
   // Event source instance. Must be declared before input objects so it
   // outlives them so thus being able to properly handle their destruction.