Add API in developerPrivate to allow/ disallow incognito mode.

chrome/browser/extensions/api/developer_private/developer_private_api.cc

Index: chrome/browser/extensions/api/developer_private/developer_private_api.cc
diff --git a/chrome/browser/extensions/api/developer_private/developer_private_api.cc b/chrome/browser/extensions/api/developer_private/developer_private_api.cc
index fb75d205dba086a1e4fe19de2248c4e3a7d29652..965a2fc51d8d8b34732142b512a15951e99bb565 100644
--- a/chrome/browser/extensions/api/developer_private/developer_private_api.cc
+++ b/chrome/browser/extensions/api/developer_private/developer_private_api.cc
@@ -409,6 +409,29 @@ bool DeveloperPrivateAllowFileAccessFunction::RunImpl() {
 DeveloperPrivateAllowFileAccessFunction::
     ~DeveloperPrivateAllowFileAccessFunction() {}
 
+bool DeveloperPrivateAllowIncognitoFunction::RunImpl() {
+  std::string extension_id;
+  bool allow = false;
+  EXTENSION_FUNCTION_VALIDATE(args_->GetString(0, &extension_id));
+  EXTENSION_FUNCTION_VALIDATE(args_->GetBoolean(1, &allow));
+
+  ExtensionService* service = profile()->GetExtensionService();
+  const Extension* extension = service->GetInstalledExtension(extension_id);
+  bool result = true;
+
+  if (!extension) {
+    result = false;
+  } else {
+    service->SetIsIncognitoEnabled(extension->id(), allow);
+  }
+
+  return true;

[asargent_no_longer_on_chrome, 2013/02/25 18:40:30]

nit: should you be returning |result| here instead of just true? (Or you could
restructure the control flow to just return false if extension == NULL above)

[Gaurav, 2013/02/25 21:43:12]

Done.

+}
+
+DeveloperPrivateAllowIncognitoFunction::
+    ~DeveloperPrivateAllowIncognitoFunction() {}
+
+
 bool DeveloperPrivateReloadFunction::RunImpl() {
   std::string extension_id;
   EXTENSION_FUNCTION_VALIDATE(args_->GetString(0, &extension_id));