WebUI: Allow rejecting a promise that is returned from cr.sendWithPromise().

chrome/browser/ui/webui/settings/md_settings_ui.h

Index: chrome/browser/ui/webui/settings/md_settings_ui.h
diff --git a/chrome/browser/ui/webui/settings/md_settings_ui.h b/chrome/browser/ui/webui/settings/md_settings_ui.h
index 3895925b73ec1a4c9af9c21e6f966ebd679b41da..44cf7c682e81be3be233d44a84734057372f2425 100644
--- a/chrome/browser/ui/webui/settings/md_settings_ui.h
+++ b/chrome/browser/ui/webui/settings/md_settings_ui.h
@@ -29,9 +29,16 @@ class SettingsPageUIHandler : public content::WebUIMessageHandler {
 
  protected:
   // Helper method for responding to JS requests initiated with
-  // cr.sendWithPromise().
-  void CallJavascriptCallback(const base::Value& callback_id,
-                              const base::Value& response);
+  // cr.sendWithPromise(), for the case where the returned promise should be
+  // resolved (request succeeded).
+  void ResolveCallback(const base::Value& callback_id,

[Dan Beam, 2016/03/03 20:11:08]

ResolveJavascriptCallback (maayyyybbe? i guess this isn't really that ambiguous
currently, except maybe with base::Callback)

[dpapad, 2016/03/03 20:18:52]

Done.

+                       const base::Value& response);
+
+  // Helper method for responding to JS requests initiated with
+  // cr.sendWithPromise(), for the case where the returned promise should be
+  // rejected (request failed).
+  void RejectCallback(const base::Value& callback_id,
+                      const base::Value& response);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SettingsPageUIHandler);