Build HarfBuzz as loadable module when chromeos=1 under Linux

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 256 matching lines @@
 
   defines = [ "GFX_IMPLEMENTATION" ]
 
   deps = [
     ":gfx_export",
     "//base",
     "//base:base_static",
     "//base:i18n",
     "//base/third_party/dynamic_annotations",
     "//skia",
-    "//third_party/harfbuzz-ng",
     "//third_party/libpng",
     "//third_party/zlib",
     "//ui/gfx/geometry",
   ]
   public_deps = [
     "//base",
     "//skia",
+    "//third_party/harfbuzz-ng",
     "//third_party/icu",
   ]
 
   # Text rendering conditions (complicated so separated out).
   if (use_aura || is_mac) {
     # Mac doesn't use RenderTextHarfBuzz by default yet.
     sources += [
       "harfbuzz_font_skia.cc",
       "harfbuzz_font_skia.h",
       "render_text_harfbuzz.cc",
@@ skipping 496 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"
   }
 }