Use FSEvents for recursive file watch on Mac

base/base.gypi

Index: base/base.gypi
diff --git a/base/base.gypi b/base/base.gypi
index d0b7370a9acf32c3536e5b10470808330fe43a45..d973112772944d8ed3edd52a5d9088aeea8d7603 100644
--- a/base/base.gypi
+++ b/base/base.gypi
@@ -194,8 +194,12 @@
           'files/file_path_constants.cc',
           'files/file_path_watcher.cc',
           'files/file_path_watcher.h',
+          'files/file_path_watcher_fsevents.cc',
+          'files/file_path_watcher_fsevents.h',
           'files/file_path_watcher_kqueue.cc',
+          'files/file_path_watcher_kqueue.h',
           'files/file_path_watcher_linux.cc',
+          'files/file_path_watcher_mac.cc',
           'files/file_path_watcher_stub.cc',
           'files/file_path_watcher_win.cc',
           'files/file_posix.cc',
@@ -751,7 +755,10 @@
                'file_util.cc',
                'file_util_posix.cc',
                'files/file_enumerator_posix.cc',
+               'files/file_path_watcher_fsevents.cc',
+               'files/file_path_watcher_fsevents.h',
                'files/file_path_watcher_kqueue.cc',
+               'files/file_path_watcher_kqueue.h',
                'files/file_proxy.cc',
                'files/file_util_proxy.cc',
                'memory/shared_memory_posix.cc',
@@ -783,7 +790,10 @@
           ['OS == "android" and >(nacl_untrusted_build)==0', {
             'sources!': [
               'base_paths_posix.cc',
+              'files/file_path_watcher_fsevents.cc',
+              'files/file_path_watcher_fsevents.h',
               'files/file_path_watcher_kqueue.cc',
+              'files/file_path_watcher_kqueue.h',
               'files/file_path_watcher_stub.cc',
               'power_monitor/power_monitor_device_source_posix.cc',
             ],
@@ -881,7 +891,10 @@
             ],
             'sources!': [
               'event_recorder_stubs.cc',
+              'files/file_path_watcher_fsevents.cc',
+              'files/file_path_watcher_fsevents.h',
               'files/file_path_watcher_kqueue.cc',
+              'files/file_path_watcher_kqueue.h',
               'files/file_path_watcher_stub.cc',
               'message_loop/message_pump_libevent.cc',
               'posix/file_descriptor_shuffle.cc',
@@ -898,7 +911,10 @@
           }],
           ['OS == "linux" and >(nacl_untrusted_build)==0', {
             'sources!': [
+              'files/file_path_watcher_fsevents.cc',
+              'files/file_path_watcher_fsevents.h',
               'files/file_path_watcher_kqueue.cc',
+              'files/file_path_watcher_kqueue.h',
               'files/file_path_watcher_stub.cc',
             ],
           }],