Add files and exclusions needed for NaCl IPC proxy to base_untrusted target.

base/base.gypi

Index: base/base.gypi
===================================================================
--- base/base.gypi	(revision 141270)
+++ base/base.gypi	(working copy)
@@ -245,6 +245,8 @@
           'observer_list_threadsafe.h',
           'os_compat_android.cc',
           'os_compat_android.h',
+          'os_compat_nacl.cc',
+          'os_compat_nacl.h',
           'path_service.cc',
           'path_service.h',
           'pending_task.cc',
@@ -280,6 +282,7 @@
           'property_bag.h',
           'rand_util.cc',
           'rand_util.h',
+          'rand_util_nacl.cc',
           'rand_util_posix.cc',
           'rand_util_win.cc',
           'safe_strerror_posix.cc',
@@ -296,6 +299,7 @@
           'sha1_win.cc',
           'shared_memory.h',
           'shared_memory_android.cc',
+          'shared_memory_nacl.cc',
           'shared_memory_posix.cc',
           'shared_memory_win.cc',
           'single_thread_task_runner.h',
@@ -504,8 +508,28 @@
           ],
           ['>(nacl_untrusted_build)==1', {
             'sources!': [
-              'file_util.cc',
-              'files/file_path_watcher_kqueue.cc',
+               'base_paths.cc',
+               'command_line.cc',
+               'cpu.cc',
+               'debug/stack_trace_posix.cc',
+               'environment.cc',
+               'file_util.cc',
+               'file_util_posix.cc',
+               'file_util_proxy.cc',
+               'files/file_path_watcher_kqueue.cc',
+               'native_library_posix.cc',
+               'path_service.cc',
+               'platform_file_posix.cc',
+               'posix/unix_domain_socket.cc',
+               'process_posix.cc',
+               'process_util.cc',
+               'process_util_posix.cc',
+               'scoped_native_library.cc',
+               'scoped_temp_dir.cc',
+               'shared_memory_posix.cc',
+               'sys_info_posix.cc',
+               'threading/sequenced_worker_pool.cc',
+               'third_party/dynamic_annotations/dynamic_annotations.c',
             ],
           }],
           ['OS == "android" and >(nacl_untrusted_build)==0', {