[sql] Stats gathering for sql/ APIs.

storage/browser/database/database_tracker.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 "storage/browser/database/database_tracker.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 442 matching lines @@
           db_dir_,
           false,
           base::FileEnumerator::DIRECTORIES,
           kTemporaryDirectoryPattern);
       for (base::FilePath directory = directories.Next(); !directory.empty();
            directory = directories.Next()) {
         base::DeleteFile(directory, true);
       }
     }
 
+    db_->set_histogram_tag("DatabaseTracker");
+
     // If the tracker database exists, but it's corrupt or doesn't
     // have a meta table, delete the database directory.
     const base::FilePath kTrackerDatabaseFullPath =
         db_dir_.Append(base::FilePath(kTrackerDatabaseFileName));
     if (base::DirectoryExists(db_dir_) &&
         base::PathExists(kTrackerDatabaseFullPath) &&
         (!db_->Open(kTrackerDatabaseFullPath) ||
          !sql::MetaTable::DoesTableExist(db_.get()))) {
       db_->Close();
       if (!base::DeleteFile(db_dir_, true))
         return false;
     }
 
-    db_->set_histogram_tag("DatabaseTracker");
-
     databases_table_.reset(new DatabasesTable(db_.get()));
     meta_table_.reset(new sql::MetaTable());
 
     is_initialized_ =
         base::CreateDirectory(db_dir_) &&
         (db_->is_open() ||
          (is_incognito_ ? db_->OpenInMemory() :
           db_->Open(kTrackerDatabaseFullPath))) &&
         UpgradeToCurrentVersion();
     if (!is_initialized_) {
@@ skipping 371 matching lines @@
   if (!db_tracker_thread_->BelongsToCurrentThread()) {
     db_tracker_thread_->PostTask(
         FROM_HERE,
         base::Bind(&DatabaseTracker::SetForceKeepSessionState, this));
     return;
   }
   force_keep_session_state_ = true;
 }
 
 }  // namespace storage