ui: Add libsync GLFence implementation.

gpu/ipc/client/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 
 group("client") {
   if (is_component_build) {
     public_deps = [
       "//gpu",
     ]
   } else {
     public_deps = [
       ":ipc_client_sources",
     ]
   }
 }
 
 source_set("ipc_client_sources") {
   sources = [
     "command_buffer_proxy_impl.cc",
     "command_buffer_proxy_impl.h",
     "gpu_channel_host.cc",
     "gpu_channel_host.h",
     "gpu_fence_impl.cc",
     "gpu_fence_impl.h",
+    "gpu_fence_impl_shared_event.cc",
+    "gpu_fence_impl_shared_event.h",
     "gpu_memory_buffer_impl.cc",
     "gpu_memory_buffer_impl.h",
     "gpu_memory_buffer_impl_shared_memory.cc",
     "gpu_memory_buffer_impl_shared_memory.h",
   ]
   if (is_mac) {
     sources += [
       "gpu_memory_buffer_impl_io_surface.cc",
       "gpu_memory_buffer_impl_io_surface.h",
       "gpu_process_hosted_ca_layer_tree_params.cc",
       "gpu_process_hosted_ca_layer_tree_params.h",
     ]
   }
   if (is_android) {
     sources += [
       "android/in_process_surface_texture_manager.cc",
       "android/in_process_surface_texture_manager.h",
     ]
     libs = [ "android" ]
   }
+  if (is_linux) {
+    sources += [
+      "gpu_fence_impl_libsync.cc",
+      "gpu_fence_impl_libsync.h",
+    ]
+  }
   if (use_ozone) {
     sources += [
       "gpu_memory_buffer_impl_ozone_native_pixmap.cc",
       "gpu_memory_buffer_impl_ozone_native_pixmap.h",
     ]
   }
   configs += [
     "//build/config/compiler:no_size_t_to_int_warning",
     "//gpu:gpu_implementation",
   ]
   deps = [
     "//base",
     "//gpu/command_buffer/client:client_sources",
     "//gpu/command_buffer/common:common_sources",
     "//gpu/config:config_sources",
     "//gpu/ipc/common:ipc_common_sources",
     "//ipc",
     "//ui/base/",
     "//ui/events/ipc",
     "//ui/gfx/ipc",
     "//ui/gfx/ipc/geometry",
     "//ui/gl",
     "//url/ipc:url_ipc",
   ]
   if (use_ozone) {
     deps += [ "//ui/ozone" ]
   }
+  if (is_linux) {
+    deps += [ "//third_party/libsync" ]
+  }
 }