Add chrome/browser/ui to the GN build.

chrome/chrome_resources.gyp

Index: chrome/chrome_resources.gyp
diff --git a/chrome/chrome_resources.gyp b/chrome/chrome_resources.gyp
index edcbda12fed9bda1723d6fd6321dea25978bd4bc..a16631259bf676f422465bf2e924a832aa0d3200 100644
--- a/chrome/chrome_resources.gyp
+++ b/chrome/chrome_resources.gyp
@@ -84,6 +84,7 @@
           ],
           'actions': [
             {
+              # GN version: //chrome/browser/resources:component_extension_resources
               'action_name': 'generate_component_extension_resources',
               'variables': {
                 'grit_grd_file': 'browser/resources/component_extension_resources.grd',
@@ -91,6 +92,7 @@
               'includes': [ '../build/grit_action.gypi' ],
             },
             {
+              # GN version: //chrome/browser/resources:options_resources
               'action_name': 'generate_options_resources',
               'variables': {
                 'grit_grd_file': 'browser/resources/options_resources.grd',
@@ -98,6 +100,7 @@
               'includes': [ '../build/grit_action.gypi' ],
             },
             {
+              # GN version: //chrome/browser/resources:quota_internals_resources
               'action_name': 'generate_quota_internals_resources',
               'variables': {
                 'grit_grd_file': 'browser/resources/quota_internals_resources.grd',
@@ -105,6 +108,7 @@
               'includes': [ '../build/grit_action.gypi' ],
             },
             {
+              # GN version: //chrome/browser/resources:sync_file_system_internals_resources
               'action_name': 'generate_sync_file_system_internals_resources',
               'variables': {
                 'grit_grd_file': 'browser/resources/sync_file_system_internals_resources.grd',
@@ -114,6 +118,7 @@
           ],
           'copies': [
             {
+              # GN version: //chrome/browser/resources:extension_resource_demo
               'destination': '<(PRODUCT_DIR)/resources/extension/demo',
               'files': [
                 'browser/resources/extension_resource/demo/library.js',