Update mojo sdk to rev c02a28868825edfa57ab77947b8cb15e741c5598

third_party/mojo/src/mojo/edk/mojo_edk.gni

Index: third_party/mojo/src/mojo/edk/mojo_edk.gni
diff --git a/third_party/mojo/src/mojo/edk/mojo_edk.gni b/third_party/mojo/src/mojo/edk/mojo_edk.gni
index b90462de81bef8b875075de5bd5dc861eaadb9b0..21ad315a96af5baa5633da398007f87e850b57f9 100644
--- a/third_party/mojo/src/mojo/edk/mojo_edk.gni
+++ b/third_party/mojo/src/mojo/edk/mojo_edk.gni
@@ -95,3 +95,9 @@ template("mojo_edk_source_set") {
     }
   }
 }
+
+# Build EDK things with static thread annotation analysis enabled.
+# TODO(vtl): Should we set this at a higher level?
+if (is_clang) {
+  cflags = [ "-Wthread-safety" ]
+}