Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/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/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 2219 matching lines @@
 
   if (use_x11) {
     sources += [
       "chrome_browser_main_extra_parts_x11.cc",
       "chrome_browser_main_extra_parts_x11.h",
       "password_manager/password_store_x.cc",
       "password_manager/password_store_x.h",
     ]
   }
   if (use_aura && !use_ozone && is_desktop_linux) {
-    deps += [ "//chrome/browser/ui/libgtk2ui" ]
-    allow_circular_includes_from += [ "//chrome/browser/ui/libgtk2ui" ]
+    if (use_gtk3) {
+      deps += [ "//chrome/browser/ui/libgtkui:libgtk3ui" ]
+    } else {
+      deps += [ "//chrome/browser/ui/libgtkui:libgtk2ui" ]
+    }
   }
   if (is_posix && !is_mac) {
     sources += [
       "//chrome/app/chrome_crash_reporter_client.cc",
       "//chrome/app/chrome_crash_reporter_client.h",
     ]
     deps += [
       "//components/crash/content/app",
       "//components/crash/content/browser",
       "//components/version_info:generate_version_info",
@@ skipping 105 matching lines @@
   }
   if (enable_themes) {
     sources += [
       "sync/glue/theme_data_type_controller.cc",
       "sync/glue/theme_data_type_controller.h",
       "themes/browser_theme_pack.cc",
       "themes/browser_theme_pack.h",
       "themes/custom_theme_supplier.cc",
       "themes/custom_theme_supplier.h",
       "themes/theme_properties.cc",
-      "themes/theme_properties.h",
       "themes/theme_service.cc",
       "themes/theme_service.h",
       "themes/theme_service_factory.cc",
       "themes/theme_service_factory.h",
       "themes/theme_service_mac.mm",
       "themes/theme_syncable_service.cc",
       "themes/theme_syncable_service.h",
     ]
+    deps += [ ":theme_properties" ]
   }
 
   if (enable_basic_printing || enable_print_preview) {
     # Some form of printing support.
     sources += [
       "printing/print_job.cc",
       "printing/print_job.h",
       "printing/print_job_manager.cc",
       "printing/print_job_manager.h",
       "printing/print_job_worker.cc",
@@ skipping 1570 matching lines @@
     deps = [
       "//base",
       "//chrome/common:constants",
     ]
     if (enable_configuration_policy) {
       deps += [ "//chrome/browser/policy:path_parser" ]
     }
   }
 }
 
+source_set("theme_properties") {
+  sources = [
+    "themes/theme_properties.h",
+  ]
+}
+
 proto_library("resource_prefetch_predictor_proto") {
   sources = [
     "predictors/resource_prefetch_predictor.proto",
   ]
 }
 
 grit("resources") {
   source = "browser_resources.grd"
   use_qualified_include = true
 
@@ skipping 353 matching lines @@
   # linking all of the test support.
   static_library("pepper_cdm_test_constants") {
     testonly = true
     visibility = [ "//chrome/*" ]
     sources = [
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }