Add the "options_ui" extension manifest field.

chrome/browser/ui/webui/extensions/extension_settings_handler.cc

Index: chrome/browser/ui/webui/extensions/extension_settings_handler.cc
diff --git a/chrome/browser/ui/webui/extensions/extension_settings_handler.cc b/chrome/browser/ui/webui/extensions/extension_settings_handler.cc
index 87f8a3f36844f54f833d0421a7037ae9a4f32f73..85d5bf6d5ef5b140773c1db4c21cffc839ed250e 100644
--- a/chrome/browser/ui/webui/extensions/extension_settings_handler.cc
+++ b/chrome/browser/ui/webui/extensions/extension_settings_handler.cc
@@ -92,6 +92,7 @@
 #include "extensions/common/manifest.h"
 #include "extensions/common/manifest_handlers/background_info.h"
 #include "extensions/common/manifest_handlers/incognito_info.h"
+#include "extensions/common/manifest_handlers/options_page_info.h"
 #include "extensions/common/permissions/permissions_data.h"
 #include "extensions/common/switches.h"
 #include "grit/browser_resources.h"
@@ -270,6 +271,10 @@ base::DictionaryValue* ExtensionSettingsHandler::CreateExtensionDetailValue(
   extension_data->SetBoolean("is_platform_app", extension->is_platform_app());
   extension_data->SetBoolean("homepageProvided",
       ManifestURL::GetHomepageURL(extension).is_valid());
+  extension_data->SetBoolean("options_chrome_style",

[not at google - send to devlin, 2014/08/29 05:39:23]

When would you need to access this?

[ericzeng, 2014/08/29 16:52:22]

I'm not sure, if the UA stylesheet is handled all in C++ then I suppose I don't
need it here. 

[ericzeng, 2014/08/29 22:08:50]

Done.

+                             OptionsPageInfo::ChromeStyle(extension));
+  extension_data->SetBoolean("options_open_in_tab",
+                             OptionsPageInfo::OpenInTab(extension));
 
   // Add dependent extensions.
   base::ListValue* dependents_list = new base::ListValue;
@@ -1125,7 +1130,7 @@ void ExtensionSettingsHandler::HandleUninstallMessage(
 void ExtensionSettingsHandler::HandleOptionsMessage(
     const base::ListValue* args) {
   const Extension* extension = GetActiveExtension(args);
-  if (!extension || ManifestURL::GetOptionsPage(extension).is_empty())
+  if (!extension || OptionsPageInfo::GetOptionsPage(extension).is_empty())
     return;
   ExtensionTabUtil::OpenOptionsPage(extension,
       chrome::FindBrowserWithWebContents(web_ui()->GetWebContents()));