Update mojo sdk to rev c02a28868825edfa57ab77947b8cb15e741c5598

third_party/mojo/src/mojo/edk/system/BUILD.gn

Index: third_party/mojo/src/mojo/edk/system/BUILD.gn
diff --git a/third_party/mojo/src/mojo/edk/system/BUILD.gn b/third_party/mojo/src/mojo/edk/system/BUILD.gn
index 95ee992e1484fb335a28b45350c33c51cb32241c..5dd2682ceab5046199bcacf9a19755efa63d2029 100644
--- a/third_party/mojo/src/mojo/edk/system/BUILD.gn
+++ b/third_party/mojo/src/mojo/edk/system/BUILD.gn
@@ -82,6 +82,8 @@ component("system") {
     "message_pipe_dispatcher.h",
     "message_pipe_endpoint.cc",
     "message_pipe_endpoint.h",
+    "mutex.cc",
+    "mutex.h",
     "options_validation.h",
     "platform_handle_dispatcher.cc",
     "platform_handle_dispatcher.h",
@@ -103,6 +105,7 @@ component("system") {
     "simple_dispatcher.h",
     "slave_connection_manager.cc",
     "slave_connection_manager.h",
+    "thread_annotations.h",
     "transport_data.cc",
     "transport_data.h",
     "unique_identifier.cc",
@@ -189,6 +192,7 @@ test("mojo_system_unittests") {
     "message_pipe_test_utils.h",
     "message_pipe_unittest.cc",
     "multiprocess_message_pipe_unittest.cc",
+    "mutex_unittest.cc",
     "options_validation_unittest.cc",
     "platform_handle_dispatcher_unittest.cc",
     "raw_channel_unittest.cc",
@@ -199,6 +203,7 @@ test("mojo_system_unittests") {
     "simple_dispatcher_unittest.cc",
     "test_channel_endpoint_client.cc",
     "test_channel_endpoint_client.h",
+    "thread_annotations_unittest.cc",
     "unique_identifier_unittest.cc",
     "waiter_test_utils.cc",
     "waiter_test_utils.h",