MacViews: draw Mac combobox arrows

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 558 matching lines @@
   args = [
     # TODO(brettw) bug 535386: This should not take a directory as an input,
     # but rather a response file listing the inputs or sometimes the build will
     # be incorrect. In this case, Ninja won't be able to do proper dependency
     # tracking since if a file is deleted, the command line will be the same
     # and the action will not be re-run.
     "--working_directory=" + rebase_path("vector_icons/"),
     "--output_cc=" + rebase_path(vector_icons_cc_file, root_build_dir),
     "--output_h=" + rebase_path(vector_icons_h_file, root_build_dir),
   ]
+
+  if (is_mac) {
+    sources += [ "vector_icons/combobox_arrow_mac.icon" ]
+  }
 }
 
 # Looking for gfx_geometry? It's //ui/gfx/geometry:geometry
 
 # Depend on this to use native_widget_types.h without pulling in all of gfx.
 source_set("native_widget_types") {
   public = [
     "native_widget_types.h",
   ]
 
@@ skipping 261 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"
   }
 }