Add APIs to protect critical tasks on iOS.

base/base.gypi

Index: base/base.gypi
diff --git a/base/base.gypi b/base/base.gypi
index 63362f1d84016073c23093403abacaeafea8a6d8..14527572d18fde5f906ac51b1af51459dc0c971b 100644
--- a/base/base.gypi
+++ b/base/base.gypi
@@ -86,6 +86,9 @@
           'compiler_specific.h',
           'cpu.cc',
           'cpu.h',
+	  'critical_closure.h',
+          'critical_closure_ios.mm',
+          'critical_closure_stub.cc',

[stuartmorgan, 2012/07/31 07:58:15]

There needs to be a line later that excludes this file on iOS. Did this actually
compile?

[Chen Yu, 2012/07/31 10:38:50]

Yes, somehow it does compile (I build target 'base' and 'base_unittests'; I did
a test by making a function call to MakeCriticalClosure() and it is the iOS
version that is called; I also tried by adding another implementation file and
still pass the compilation. Not clear how compiler handles it)

I excluded the _stub.cc file for iOS. Thanks!

On 2012/07/31 07:58:15, stuartmorgan wrote:

           'debug/alias.cc',
           'debug/alias.h',
           'debug/debug_on_start_win.cc',
@@ -151,6 +154,8 @@
           'hi_res_timer_manager_win.cc',
           'hi_res_timer_manager.h',
           'id_map.h',
+          'ios/scoped_critical_action.h',
+          'ios/scoped_critical_action.mm',
           'json/json_file_value_serializer.cc',
           'json/json_file_value_serializer.h',
           'json/json_parser.cc',