gpu: Add GpuFence framework.

gpu/command_buffer/service/BUILD.gn

 # Copyright 2014 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")
 import("//third_party/protobuf/proto_library.gni")
 
 group("service") {
   if (is_component_build) {
     public_deps = [
@@ skipping 32 matching lines @@
     "context_group.cc",
     "context_group.h",
     "context_state.cc",
     "context_state.h",
     "context_state_autogen.h",
     "context_state_impl_autogen.h",
     "error_state.cc",
     "error_state.h",
     "feature_info.cc",
     "feature_info.h",
+    "fence_manager.cc",
+    "fence_manager.h",
     "framebuffer_completeness_cache.cc",
     "framebuffer_completeness_cache.h",
     "framebuffer_manager.cc",
     "framebuffer_manager.h",
     "gl_context_virtual.cc",
     "gl_context_virtual.h",
     "gl_state_restorer_impl.cc",
     "gl_state_restorer_impl.h",
     "gl_utils.cc",
     "gl_utils.h",
@@ skipping 128 matching lines @@
     configs -= [ "//build/config/compiler:default_optimization" ]
     configs += [ "//build/config/compiler:optimize_max" ]
   }
 }
 
 proto_library("disk_cache_proto") {
   sources = [
     "disk_cache_proto.proto",
   ]
 }