Mark some files/targets as compiled only when their associated feature is enabled.

chrome/chrome_browser.gypi

 # Copyright 2012 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.
 
 {
   'variables': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 680 matching lines @@
       'browser/media/midi_permission_context.h',
       'browser/media/midi_permission_context_factory.cc',
       'browser/media/midi_permission_context_factory.h',
       'browser/media/midi_permission_infobar_delegate.cc',
       'browser/media/midi_permission_infobar_delegate.h',
       'browser/media/native_desktop_media_list.cc',
       'browser/media/native_desktop_media_list.h',
       # TODO(brettw) should this go with the webrtc sources?
       'browser/media/webrtc_log_list.cc',
       'browser/media/webrtc_log_list.h',
-      'browser/media_galleries/gallery_watch_manager.cc',
-      'browser/media_galleries/gallery_watch_manager.h',
-      'browser/media_galleries/gallery_watch_manager_observer.h',
       'browser/memory_details.cc',
       'browser/memory_details.h',
       'browser/memory_details_android.cc',
       'browser/memory_details_linux.cc',
       'browser/memory_details_mac.cc',
       'browser/memory_details_win.cc',
       'browser/metrics/chrome_browser_main_extra_parts_metrics.cc',
       'browser/metrics/chrome_browser_main_extra_parts_metrics.h',
       'browser/metrics/chrome_metrics_service_accessor.cc',
       'browser/metrics/chrome_metrics_service_accessor.h',
@@ skipping 1183 matching lines @@
       'browser/themes/theme_service.cc',
       'browser/themes/theme_service_factory.cc',
       'browser/themes/theme_service_factory.h',
       'browser/themes/theme_service.h',
       'browser/themes/theme_service_mac.mm',
       'browser/themes/theme_syncable_service.cc',
       'browser/themes/theme_syncable_service.h',
     ],
     # Used both when enable_printing == 1 (full) and == 2 (basic)
     'chrome_browser_basic_printing_sources': [
-      'browser/printing/print_dialog_cloud.cc',
-      'browser/printing/print_dialog_cloud.h',
       'browser/printing/print_job.cc',
       'browser/printing/print_job.h',
       'browser/printing/print_job_manager.cc',
       'browser/printing/print_job_manager.h',
       'browser/printing/print_job_worker.cc',
       'browser/printing/print_job_worker.h',
       'browser/printing/print_job_worker_owner.h',
       'browser/printing/print_view_manager_base.cc',
       'browser/printing/print_view_manager_base.h',
       'browser/printing/printer_query.cc',
       'browser/printing/printer_query.h',
       'browser/printing/printing_message_filter.cc',
       'browser/printing/printing_message_filter.h',
       'browser/printing/printing_ui_web_contents_observer.cc',
       'browser/printing/printing_ui_web_contents_observer.h',
     ],
     # Used on top of the "basic" sources when enable_printing == 1 (full).
     'chrome_browser_full_printing_sources': [
       'browser/local_discovery/privet_http_impl.cc',
       'browser/local_discovery/privet_http_impl.h',
       'browser/local_discovery/pwg_raster_converter.cc',
       'browser/local_discovery/pwg_raster_converter.h',
       'browser/printing/background_printing_manager.cc',
       'browser/printing/background_printing_manager.h',
       'browser/printing/cloud_print/cloud_print_proxy_service.cc',
       'browser/printing/cloud_print/cloud_print_proxy_service_factory.cc',
       'browser/printing/cloud_print/cloud_print_proxy_service_factory.h',
       'browser/printing/cloud_print/cloud_print_proxy_service.h',
+      'browser/printing/print_dialog_cloud.cc',
+      'browser/printing/print_dialog_cloud.h',
       'browser/printing/printer_manager_dialog.h',
       'browser/printing/printer_manager_dialog_linux.cc',
       'browser/printing/printer_manager_dialog_mac.mm',
       'browser/printing/printer_manager_dialog_win.cc',
       'browser/printing/print_error_dialog.cc',
       'browser/printing/print_error_dialog.h',
       'browser/printing/print_preview_context_menu_observer.cc',
       'browser/printing/print_preview_context_menu_observer.h',
       'browser/printing/print_preview_data_service.cc',
       'browser/printing/print_preview_data_service.h',
@@ skipping 168 matching lines @@
       'browser/media_galleries/fileapi/readahead_file_stream_reader.cc',
       'browser/media_galleries/fileapi/readahead_file_stream_reader.h',
       'browser/media_galleries/fileapi/safe_audio_video_checker.cc',
       'browser/media_galleries/fileapi/safe_audio_video_checker.h',
       'browser/media_galleries/fileapi/safe_media_metadata_parser.cc',
       'browser/media_galleries/fileapi/safe_media_metadata_parser.h',
       'browser/media_galleries/fileapi/supported_audio_video_checker.cc',
       'browser/media_galleries/fileapi/supported_audio_video_checker.h',
       'browser/media_galleries/fileapi/supported_image_type_validator.cc',
       'browser/media_galleries/fileapi/supported_image_type_validator.h',
+      'browser/media_galleries/gallery_watch_manager.cc',
+      'browser/media_galleries/gallery_watch_manager.h',
+      'browser/media_galleries/gallery_watch_manager_observer.h',
       'browser/media_galleries/imported_media_gallery_registry.cc',
       'browser/media_galleries/imported_media_gallery_registry.h',
       'browser/media_galleries/linux/mtp_device_delegate_impl_linux.cc',
       'browser/media_galleries/linux/mtp_device_delegate_impl_linux.h',
       'browser/media_galleries/linux/mtp_device_object_enumerator.cc',
       'browser/media_galleries/linux/mtp_device_object_enumerator.h',
       'browser/media_galleries/linux/mtp_device_task_helper.cc',
       'browser/media_galleries/linux/mtp_device_task_helper.h',
       'browser/media_galleries/linux/mtp_device_task_helper_map_service.cc',
       'browser/media_galleries/linux/mtp_device_task_helper_map_service.h',
@@ skipping 1362 matching lines @@
       # GN version: //chrome/browser/history:in_memory_url_index_cache_proto
       'target_name': 'in_memory_url_index_cache_proto',
       'type': 'static_library',
       'sources': [ 'browser/history/in_memory_url_index_cache.proto' ],
       'variables': {
         'proto_in_dir': 'browser/history',
         'proto_out_dir': 'chrome/browser/history',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
-    {
-      # Protobuf compiler / generator for Sync FileSystem protocol buffer.
-      # GN version: //chrome/browser/sync_file_system:sync_file_system_proto
-      'target_name': 'sync_file_system_proto',
-      'type': 'static_library',
-      'sources': [
-        'browser/sync_file_system/sync_file_system.proto',
-      ],
-      'variables': {
-        'proto_in_dir': 'browser/sync_file_system',
-        'proto_out_dir': 'chrome/browser/sync_file_system',
-      },
-      'includes': [ '../build/protoc.gypi' ]
-    },
-    {
-      # Protobuf compiler / generator for Sync FileSystem protocol buffer.
-      # GN version: //chrome/browser/sync_file_system/drive_backend:sync_file_system_drive_proto
-      'target_name': 'sync_file_system_drive_proto',
-      'type': 'static_library',
-      'sources': [
-        'browser/sync_file_system/drive_backend/metadata_database.proto',
-      ],
-      'variables': {
-        'proto_in_dir': 'browser/sync_file_system/drive_backend',
-        'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
-      },
-      'includes': [ '../build/protoc.gypi' ]
-    },
   ],
   'conditions': [
     ['OS=="android"', {
       'targets': [
         {
           'target_name': 'chrome_browser_jni_headers',
           'type': 'none',
           'sources': [ '<@(chrome_browser_jni_sources)' ],
           'variables': {
             'jni_gen_package': 'chrome',
@@ skipping 66 matching lines @@
           'sources': [
             'android/java/TabLoadStatus.template',
           ],
           'variables': {
             'package_name': 'org/chromium/chrome/browser',
             'template_deps': ['browser/android/tab_load_status.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
-     },
-    ],
+    },],
+    ['enable_extensions==1', {
+      'targets': [
+        {
+          # Protobuf compiler / generator for Sync FileSystem protocol buffer.
+          # GN version: //chrome/browser/sync_file_system:sync_file_system_proto
+          'target_name': 'sync_file_system_proto',
+          'type': 'static_library',
+          'sources': [
+            'browser/sync_file_system/sync_file_system.proto',
+          ],
+          'variables': {
+            'proto_in_dir': 'browser/sync_file_system',
+            'proto_out_dir': 'chrome/browser/sync_file_system',
+          },
+          'includes': [ '../build/protoc.gypi' ]
+        },
+        {
+          # Protobuf compiler / generator for Sync FileSystem protocol buffer.
+          # GN version: //chrome/browser/sync_file_system/drive_backend:sync_file_system_drive_proto
+          'target_name': 'sync_file_system_drive_proto',
+          'type': 'static_library',
+          'sources': [
+            'browser/sync_file_system/drive_backend/metadata_database.proto',
+          ],
+          'variables': {
+            'proto_in_dir': 'browser/sync_file_system/drive_backend',
+            'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
+          },
+          'includes': [ '../build/protoc.gypi' ]
+        },
+      ],
+    },],
   ],
 }