gpu: Add GpuFence framework.

ui/gfx/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("//testing/test.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
@@ skipping 479 matching lines @@
     "generic_shared_memory_id.h",
     "gfx_export.h",
     "mac/io_surface.cc",
     "mac/io_surface.h",
     "native_pixmap_handle.cc",
     "native_pixmap_handle.h",
   ]
 
   if (!is_ios) {
     sources += [
+      "gpu_fence.h",
       "gpu_memory_buffer.cc",
       "gpu_memory_buffer.h",
       "gpu_memory_buffer_tracing.cc",
       "gpu_memory_buffer_tracing.h",
+      "shared_event.cc",
+      "shared_event.h",
     ]
   }
 
   defines = [ "GFX_IMPLEMENTATION" ]
 
   deps = [
     "//base",
     "//ui/gfx/geometry",
   ]
 }
@@ skipping 97 matching lines @@
       "mojo/struct_traits_unittest.cc",
       "nine_image_painter_unittest.cc",
       "path_mac_unittest.mm",
       "platform_font_mac_unittest.mm",
       "range/range_mac_unittest.mm",
       "range/range_unittest.cc",
       "range/range_win_unittest.cc",
       "selection_bound_unittest.cc",
       "sequential_id_generator_unittest.cc",
       "shadow_value_unittest.cc",
+      "shared_event_unittest.cc",
       "skbitmap_operations_unittest.cc",
       "skrect_conversion_unittest.cc",
       "transform_util_unittest.cc",
       "utf16_indexing_unittest.cc",
     ]
   }
 
   if (!is_android && !is_ios) {
     sources += [ "render_text_unittest.cc" ]
   }
@@ skipping 87 matching lines @@
 
 fuzzer_test("color_transform_fuzztest") {
   sources = [
     "color_transform_fuzzer.cc",
   ]
   deps = [
     ":gfx",
   ]
   libfuzzer_options = [ "max_len=1024" ]
 }