Add GenericSharedMemoryId and use w/ GpuMemoryBuffer

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")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
@@ skipping 85 matching lines @@
     "font_list_impl.cc",
     "font_list_impl.h",
     "font_render_params.cc",
     "font_render_params.h",
     "font_render_params_android.cc",
     "font_render_params_linux.cc",
     "font_render_params_mac.cc",
     "font_render_params_win.cc",
     "gdi_util.cc",
     "gdi_util.h",
+    "generic_shared_memory_id.cc",
+    "generic_shared_memory_id.h",
     "gfx_paths.cc",
     "gfx_paths.h",
     "gpu_memory_buffer.cc",
     "gpu_memory_buffer.h",
     "hud_font.cc",
     "hud_font.h",
     "icon_util.cc",
     "icon_util.h",
     "image/canvas_image_source.cc",
     "image/canvas_image_source.h",
@@ skipping 523 matching lines @@
 if (is_android) {
   generate_jni("gfx_jni_headers") {
     sources = [
       "../android/java/src/org/chromium/ui/gfx/BitmapHelper.java",
       "../android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java",
       "../android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java",
     ]
     jni_package = "gfx"
   }
 }