[Extensions Bindings] Add support for updateArgumentsPreValidate

extensions/renderer/api_binding_types.h

Index: extensions/renderer/api_binding_types.h
diff --git a/extensions/renderer/api_binding_types.h b/extensions/renderer/api_binding_types.h
index c9edc46941601bfb7af86bcee9c3dc3123978b4b..2bf756336824a91733584c7248648d30d1cfc086 100644
--- a/extensions/renderer/api_binding_types.h
+++ b/extensions/renderer/api_binding_types.h
@@ -21,6 +21,15 @@ using RunJSFunction = base::Callback<void(v8::Local<v8::Function>,
                                           int argc,
                                           v8::Local<v8::Value>[])>;
 
+// A callback to execute the given v8::Function synchronously and return the
+// result. Note that script can be suspended, so you need to be certain that
+// it is not before expected a synchronous result.
+using RunJSFunctionSync =
+    base::Callback<v8::Global<v8::Value>(v8::Local<v8::Function>,

[jbroman, 2017/01/02 19:46:38]

Mind a comment alluding to why this returns a Global<Value> rather than a
Local<Value> as would be usual? Ordinarily I'd expect that (using an
EscapableHandleScope), so this signature seems odd except for the way it's
implemented using WebLocalFrame's interface.

[Devlin, 2017/01/04 17:57:02]

Done.

+                                         v8::Local<v8::Context>,
+                                         int argc,
+                                         v8::Local<v8::Value>[])>;
+
 }  // namespace binding
 }  // namespace extensions