ServiceWorker: Add UMA for ServiceWorkerDatabase

content/browser/service_worker/service_worker_database.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DATABASE_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DATABASE_H_
 
 #include <map>
 #include <set>
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/sequence_checker.h"
 #include "base/time/time.h"
 #include "content/common/content_export.h"
 #include "content/common/service_worker/service_worker_status_code.h"
 #include "url/gurl.h"
 
 namespace leveldb {
 class DB;
 class Env;
-class Status;
 class WriteBatch;
 }
 
 namespace content {
 
 // Class to persist serviceworker registration data in a database.
 // Should NOT be used on the IO thread since this does blocking
 // file io. The ServiceWorkerStorage class owns this class and
 // is responsible for only calling it serially on background
 // non-IO threads (ala SequencedWorkerPool).
 class CONTENT_EXPORT ServiceWorkerDatabase {
  public:
   // We do leveldb stuff in |path| or in memory if |path| is empty.
   explicit ServiceWorkerDatabase(const base::FilePath& path);
   ~ServiceWorkerDatabase();
 
+  // Used in UMA. A new value must be appended only.
   enum Status {
     STATUS_OK,
     STATUS_ERROR_NOT_FOUND,
+    STATUS_ERROR_IO_ERROR,
     STATUS_ERROR_CORRUPTED,
     STATUS_ERROR_FAILED,
+    STATUS_ERROR_MAX,
   };
 
   struct CONTENT_EXPORT RegistrationData {
     // These values are immutable for the life of a registration.
     int64 registration_id;
     GURL scope;
     GURL script;
 
     // Versions are first stored once they successfully install and become
     // the waiting version. Then transition to the active version. The stored
@@ skipping 208 matching lines @@
   // Bumps the next available id if |used_id| is greater than or equal to the
   // cached one.
   void BumpNextRegistrationIdIfNeeded(
       int64 used_id,
       leveldb::WriteBatch* batch);
   void BumpNextVersionIdIfNeeded(
       int64 used_id,
       leveldb::WriteBatch* batch);
 
   bool IsOpen();
-
-  void HandleError(
-      const tracked_objects::Location& from_here,
-      const leveldb::Status& status);
+  void Disable();
 
   base::FilePath path_;
   scoped_ptr<leveldb::Env> env_;
   scoped_ptr<leveldb::DB> db_;
 
   int64 next_avail_registration_id_;
   int64 next_avail_resource_id_;
   int64 next_avail_version_id_;
 
   enum State {
     UNINITIALIZED,
     INITIALIZED,
     DISABLED,
   };
   State state_;
 
   base::SequenceChecker sequence_checker_;
 
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, OpenDatabase);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, OpenDatabase_InMemory);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, DatabaseVersion);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, GetNextAvailableIds);
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerDatabase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DATABASE_H_