Provide UI for per-extension enabling/disabling of error collection.

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/api/developer_private/developer_private_api.h"
 
 #include "apps/app_load_service.h"
 #include "apps/app_restore_service.h"
 #include "apps/app_window.h"
 #include "apps/app_window_registry.h"
@@ skipping 371 matching lines @@
               const RuntimeError* error =
                   static_cast<const RuntimeError*>(*iter);
               scoped_ptr<base::DictionaryValue> value = error->ToValue();
               bool can_inspect = content::RenderViewHost::FromID(
                                      error->render_process_id(),
                                      error->render_view_id()) != NULL;
               value->SetBoolean("canInspect", can_inspect);
               info->runtime_errors.push_back(make_linked_ptr(value.release()));
               break;
             }
+            case ExtensionError::NUM_ERROR_TYPES:
+              NOTREACHED();
+              break;
           }
         }
       }
     } else {
       for (std::vector<extensions::InstallWarning>::const_iterator it =
                item.install_warnings().begin();
            it != item.install_warnings().end();
            ++it) {
         scoped_ptr<developer::InstallWarning> warning(
             new developer::InstallWarning);
@@ skipping 952 matching lines @@
   }
 
   error_ui_util::HandleOpenDevTools(dict);
 
   return true;
 }
 
 }  // namespace api
 
 }  // namespace extensions